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6/22/2025 3:45:21 PM EDT
Kel-Tec RDB 1,000 Round Review -- The Bullpup That Punches Up

Video review from FitNFire
6/22/2025 5:23:23 PM EDT
[#1]
No problems with mine at all.

"According to Argonne National Laboratory, it takes 100 pounds of battery in an EV to go a distance achieved by only one pound of gasoline in an ICE vehicle"
6/23/2025 4:22:38 AM EDT
[#2]
mine has been flawless , and has around 1000 rds
6/28/2025 6:52:56 PM EDT
[#3]
I do wish I had the confidence to spend money on Kel-Tec these days. Love their designs (Been wanting an RFB especially, ever since I was a teen), but I've been less than impressed with their QC and build construction. I loved my KSG, but I've had to help out friends and family with their Sub-2000s and CMR-30s to get them back to Kel-Tec for warranty work. Most of them needed two trips, and the only one that needed a single trip was fixed at home with a stick because the pin kept flopping out.
6/28/2025 6:56:36 PM EDT
[#4]
@LazyEngineer
I sell firearms produced by the finest child labor in the world, be it Filipino, Muslim, Mormon, Arizonan, or Texan.
6/28/2025 7:52:31 PM EDT
[#5]
Quote History
Originally Posted By WriterClarke:
I do wish I had the confidence to spend money on Kel-Tec these days. Love their designs (Been wanting an RFB especially, ever since I was a teen), but I've been less than impressed with their QC and build construction. I loved my KSG, but I've had to help out friends and family with their Sub-2000s and CMR-30s to get them back to Kel-Tec for warranty work. Most of them needed two trips, and the only one that needed a single trip was fixed at home with a stick because the pin kept flopping out.
View Quote

I have both the RDB and RFB (as early as I could get either gun).
Never worried about QC. Both guns worked, no screws worked their way out. Been stellar performers,
6/28/2025 8:19:24 PM EDT
[#6]
Quote History
Originally Posted By Odinforever2000:

I have both the RDB and RFB (as early as I could get either gun).
Never worried about QC. Both guns worked, no screws worked their way out. Been stellar performers,
View Quote


I'm glad to hear it. It's just a kind of situation that I'd need to be absolutely flush with money and already be set with a rifle I can trust before I could commit to a Kel-Tec again.
6/28/2025 10:33:13 PM EDT
[#7]
Quote History
Originally Posted By WriterClarke:


I'm glad to hear it. It's just a kind of situation that I'd need to be absolutely flush with money and already be set with a rifle I can trust before I could commit to a Kel-Tec again.
View Quote

Nice part about..at least the Rdb..they can be found for around 600.. Rfb used sometimes can be found for 800..

My rdb is my go to rifle that I would trust my life to.
6/28/2025 11:40:21 PM EDT
[Last Edit: _DR][Edited] [#8]
Quote History
Originally Posted By Odinforever2000:
My rdb is my go to rifle that I would trust my life to.
View Quote


Zero failures after 520 rounds on mine so far, no cleaning done except a CLP soaked patch down the bore after ever range trip.


"According to Argonne National Laboratory, it takes 100 pounds of battery in an EV to go a distance achieved by only one pound of gasoline in an ICE vehicle"
6/29/2025 9:49:07 AM EDT
[Last Edit: lazyengineer][Edited] [#9]
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:




- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)


(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.


You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.


7/2/2025 9:14:33 AM EDT
[#10]
Quote History
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.


View Quote



Thanks for the tips. I haven't touched my gas settings at all.

"According to Argonne National Laboratory, it takes 100 pounds of battery in an EV to go a distance achieved by only one pound of gasoline in an ICE vehicle"
7/2/2025 10:06:11 AM EDT
[#11]
Quote History
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.


View Quote

I just did a search for RDB in the last month..and poof.
7/2/2025 10:46:06 AM EDT
[#12]
Quote History
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.


View Quote


Judges people for having time to watch a YouTube video, writes War and Peace on a forum 😂 Great info though, joking aside.
7/2/2025 11:27:57 AM EDT
[#13]
Quote History
Originally Posted By cayman_shen:


Judges people for having time to watch a YouTube video, writes War and Peace on a forum 😂 Great info though, joking aside.
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By cayman_shen:
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.




Judges people for having time to watch a YouTube video, writes War and Peace on a forum 😂 Great info though, joking aside.

That's a fair point actually.  Item of note being youtube requires audio as well as streaming video.  That typically requires being in a setting where one can do both, which not everybody has all day long!
7/4/2025 9:40:50 AM EDT
[Last Edit: _DR][Edited] [#14]
Quote History
Originally Posted By lazyengineer:

That's a fair point actually.  Item of note being youtube requires audio as well as streaming video.  That typically requires being in a setting where one can do both, which not everybody has all day long!
View Quote


I have been known to watch YouTube at work with subtitles only.

"According to Argonne National Laboratory, it takes 100 pounds of battery in an EV to go a distance achieved by only one pound of gasoline in an ICE vehicle"
7/4/2025 10:25:58 AM EDT
[#15]
Quote History
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.


View Quote


@lazyengineer

What aftermarket forend is on that RDB?  Totally changes the look of the gun in a good way.


Sven
Manticore Arms
Advanced Fighting Gear for the AR, AK, AUG, Tavor, and Scorpion EVO! www.manticorearms.com
7/4/2025 12:18:11 PM EDT
[#16]
Quote History
Originally Posted By Manticore_Arms:


@lazyengineer

What aftermarket forend is on that RDB?  Totally changes the look of the gun in a good way.


Sven
Manticore Arms
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By Manticore_Arms:
Originally Posted By lazyengineer:
Haven't watched the video yet (honestly, you dudes have a whole shit load of free private time to watch videos all day!)

Do I trust my life to the RDB?   y..yesss, with the following

This is how tidy a Grab and go 17" 5.56 gun it is:

https://i.postimg.cc/fyY5vjDn/20250607_103053.jpg


- Make sure you run 1000 rounds through it first, and run it HOT.  Handle it.  Bump it around.  Figure that gun out.  Run a spectrum of ammo.  From that you will learn the following critical items:
- Gas settings for what ammo.  Mark with nail polish.
- which of the 100 F'ing screw come loose  and need to be loctight (it will be about a dozen - or more)
-zero and zero shift and accuracy.   and heat behavior.  Beware the gas system chosen is soft.  So soft that it will give you a very pleasant mild 1/2 second recoil impulse if you tune it to the right setting just so.  Which is great for bench slow-fire.  NOT great for CQB snap back on target multi-shots.  Run that gas a couple clicks hotter then that.
- Beware the hot gas system will heat up the gun and metal contact points in a hurry.  Figure that out
-Beware the hot gas system is the front attachment point of the picatinny rail your sight system is attached to.  run you scope as far back from that thermally expanding location as you possibly can.
-Beware the hot gas system block, is also the mount point of your handrail.  If you use a cool tactical railed handguard, that will be connected to that block via screws.  That heat will walk your mount screws.   Change of tension of your handguard mount screws there appears to move your zero (I think).
-Beware the grip point of one handed carry of the RDB, can inadvertently cause magazine release.  I consider this to be the most serious of all the design defects of the gun for serious field craft usage.  You will carry the gun there at some point, and you will eventually drop your mag from doing so.  (overfixation on silly irrelevant time savings on reloading a semi-auto civilian gun irks me - this is a terrible trade-off for game-boy 1/5th second time savings, for when rifle shots 1-30 apparently failed to do the job.  A more secure system means you get to reliably have shot #2-30!!)

https://i.postimg.cc/MK8QBJLF/20250518_133529.jpg
(it just did that to me.  First time, but pissed me off)

-Remove the back 2 (round metal) sling swivel points.  They are secured by a weak retaining ring that will fail when that point gets whacked.  which will drift the point into the gun and block hammer drop.  They arent needed, just pull them out, they are a design flaw for actual bang around field craft.

https://i.postimg.cc/m2NFN6f2/20250518_133026.jpg
You can leave the related holes there open, it wont hurt anything, but I covered mine with an HK sticker

-For the supressor bros (I'm not), this is the single best 5.56 of any type design or configuration, for running a supressor.  There is no ejection port or seam for gas leaks - it ejects downward, and has a steel face shield to protect from blast, (if things go very very wrong), and an very adjustable gas system.  17" ballistics the size and weight of a MK18.

Do I trust my life to my RDB?  YES!  for a weekend or day deployment.  It's my primary, in fact.   For Afghanistan for a year...  don't know about that.  

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  With all that, and actually knowing how to run my RDB, it is hands down my favorite 5.56 Bullpup.  My AUG has been mothballed.




@lazyengineer

What aftermarket forend is on that RDB?  Totally changes the look of the gun in a good way.


Sven
Manticore Arms


Thanks!  It's from Lucky Irishman.  They offer 2 designs, and I like the look of this one best.
7/4/2025 12:39:26 PM EDT
[Last Edit: lazyengineer][Edited] [#17]
Finally watched the video.  It's OK.  Good to see the gun being talked about, but a lot of nuances aren't really mentioned - which I would have expected with a 1000 round count implied harsh-usage test, title.  I'm not a suppressor guy.   I'm not really a glass-snob like he is.   But heck, I suspect most viewers who will watch his video are more aligned with his preferences on such, than with me.

But no - the 1990's are over - you don't need $2500 glass to run.   $2500 glass is better, and $50 Amazon glass is still shit.  But you can run $300 glass and do pretty OK these days.  I agree that glass should match gun-price, and so $1000 guns get closer to $1000 glass.  But $700 guns, can run just fine with good $250 glass, such as from PA.

He hasn't experiences the user-failures that a guy who runs his gun again and gain and again, will experience - as I noted in my prior posts.  And I notice in pictures of other heavy RDB owners, they tend look more like mine, than his factory-issue-factory-new looking gun.  He doesn't mention gun-heat at all.  That cross pin in the handguard will burn your bare hand pretty good once you do a couple mag dumps in it.   He did a decent job talking about the gas and trigger system.

He mentions the trigger has a "weird" sound.  It sure does.  That hammer is odd - it has the worlds longest hammer fall ever since ever; which they had to do to give a good trigger, vs a linkage based trigger.  Which likely is related to his comment.

I do agree with him that the bolt-release is a bit cumbersome.  It's OK.  

As to "manual of arms" - a lot of people think having an accessible ejection port is the only way to service the gun.  That's not really true, you can access up into the action through the mag-well.  In general the gun is remarkably reliable, and if things go amiss, running the bolt will take care of much.   It does have its own unique manual of arms - you really need to run a lot of rounds through it to learn it.

At the current price-point, anyone interested enough in the RDB to read this thread, is nuts not buying one right now.  These were $1000 just 2 years ago.  Now they're on sale for ~$700, brand new - if you shop.
7/4/2025 1:15:41 PM EDT
[Last Edit: Tomac][Edited] [#18]
Quote History
Originally Posted By lazyengineer:
(Snip)

I love LOVE the design, and wish Smith and Wesson would steal.it and professionally update it.  
View Quote


This x100. I briefly owned an RDB (bought it for the spousal unit) and imho the design is excellent but is lacking in execution (Kel-Tec, remember?).
I love the weight and handling but the moment I took it apart for cleaning, it was .
Eternity is coming for us all. It cannot be denied, debated or avoided.
We would do well to ponder how we're going to spend that eternity, because eternity is a long time to be wrong.
8/4/2026 3:05:17 PM EDT
[#19]
Has anybody used Keltec warranty service?  Wondering how they facilitate shipping for a repair return.

I just bought a brand new 20” and I dry fired it successfully once and then on second cocking to feel trigger reset the hammer wouldn’t stay cocked.  If I Safe it with the bolt retracted the bolt stays back, but then releasing the safety drops the hammer with no trigger pressure applied.  I didn’t see anything in the manual beforehand about dry functioning being an issue.

After taking the lower off the upper so that I can see the trigger group and manually move the hammer, the sear doesn’t move up to engage the sear bar when the hammer is cocked.  I can’t see what the trigger bar below the sear is doing.  None of the springs appear out of place or broken.  

The mechanism is too complicated / unknown order of assembly for me to take apart further so it’s going to need to go back. I wish I had kept the outer box from my home business FFL buddy who is 2 hours away and soon moving out of state.

Bought it as a range toy to try out bullpup concept and had a couple of different orphaned optics looking for a home.   Any more shipping firearms always gives me unease.
8/4/2026 3:37:14 PM EDT
[#20]
Hit up Keltec and they'll send you a shipping label.  You drop it off at UPS and it comes back 2 weeks later.  It did take a few days for me to get a shipping label from them after they said they would send it.

I'm in Chandler if you need a box, I have the factory box you can use.

I had to ship back a KS-7.  It had a cycling problem before I even shot it.  It worked fine at first.  I field stripped it to clean it before going to the range and it never worked correctly again.  I don't know if I did something wrong or it there was an issue with the gun.  But I sent it in and they fixed it.  They did not include any notes on what was done to fix the problem.  

I have 3x Keltec RDBs.  Two are the standard version, I got the black on first and got a deal on a green one.  I'll probably sell or trade the black one when I come across the right price or deal.  The last one is a 20" green hunter (which made me get the green standard RDB).  I love how extra quirky the Hunter is over the standard RDB.  It actually is pretty comfortable to handle.  It is pretty low profile, particularly with a 20rd mag in it.  I'm a designer, so I appreciate someone squeezing out such on odd rifle.
8/5/2026 1:08:43 AM EDT
[#21]
Thanks, I found a box. Found their website where you request warranty service.  

I’ve owned and shot a lot of Keltecs (Sub2000 Gen 1 & Gen 2, P11s, P32s, PF9) and never had any mechanical failures or parts breakage in moderate use.  I did learn their lifetime warranty is now only for original owner.  For my 90s Keltecs I’m not sure I could put my finger on non-faded receipts.

Oh well.  Too hot to shoot much outside for another month maybe.

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