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Mk 18 / CQBR (Page 1473 of 1573)
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Link Posted: 8/26/2021 10:41:18 PM EDT
[#1]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By brodband8:
I like how the guy in the last pic went straight for the peq2
View Quote

Probably trying to finish up his clone build and get it posted on the 'gram.
Link Posted: 8/26/2021 11:33:53 PM EDT
[#2]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By AZ_SBR:

Probably trying to finish up his clone build and get it posted on the 'gram.
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By AZ_SBR:
Originally Posted By brodband8:
I like how the guy in the last pic went straight for the peq2

Probably trying to finish up his clone build and get it posted on the 'gram.

My pockets would be full
Link Posted: 8/26/2021 11:52:46 PM EDT
[#3]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By BePhreed:
I’d be willing to bet contractor guns or COTS purchases to furnish a local national force. Commercial parts and the dated PEQs lead me to that conclusion. Could be totally wrong.
View Quote


Yep. A contractor over there a week or two ago made a thread in GD. Said his ar had a dd mk18 upper with a peq-2. Think he said he was using his own optic.
Link Posted: 8/27/2021 12:03:29 AM EDT
[#4]
Speaking of newly acquired PEQ-2's, I was finally able to get mine today! Craziest thing, a buddy just got back from what he called a vacation and said he had a few spares lying around. Go figure...

For legal reasons I must clarify that the above statement is a joke. I did get it today, but from an entirely legitimate source.

Link Posted: 8/27/2021 2:55:32 AM EDT
[#5]
Link Posted: 8/27/2021 2:32:30 PM EDT
[#6]
I know the Tan Anodized Colt Buffer tube is not Clone correct, but i want to do it so bad.
Would you guys flame me for that OR approve it?


OR

Should i stick with the black buffer tube since everything else is clone correct right down to my Tan Gen 1 LMT Buttstock ?
Link Posted: 8/27/2021 3:01:01 PM EDT
[#7]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FastCar:
I know the Tan Anodized Colt Buffer tube is not Clone correct, but i want to do it so bad.
Would you guys flame me for that OR approve it?


OR

Should i stick with the black buffer tube since everything else is clone correct right down to my Tan Gen 1 LMT Buttstock ?
View Quote

Non black anodized buffer tubes are gay.
Link Posted: 8/27/2021 3:06:17 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FastCar:
I know the Tan Anodized Colt Buffer tube is not Clone correct, but i want to do it so bad.
Would you guys flame me for that OR approve it?


OR

Should i stick with the black buffer tube since everything else is clone correct right down to my Tan Gen 1 LMT Buttstock ?
View Quote


Black and rattle can is the way

CD
Link Posted: 8/27/2021 3:38:52 PM EDT
[#9]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By UndrGrndPrdcts:

Non black anodized buffer tubes are gay.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By UndrGrndPrdcts:
Originally Posted By FastCar:
I know the Tan Anodized Colt Buffer tube is not Clone correct, but i want to do it so bad.
Would you guys flame me for that OR approve it?


OR

Should i stick with the black buffer tube since everything else is clone correct right down to my Tan Gen 1 LMT Buttstock ?

Non black anodized buffer tubes are gay.


Attachment Attached File
Link Posted: 8/27/2021 5:46:06 PM EDT
[#10]
Link Posted: 8/27/2021 7:25:36 PM EDT
[#11]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:

Will probably all end up in the shredder.
View Quote



I'm going to guess anniston for reclamation. There are UID tags in that lot.

Link Posted: 8/27/2021 10:44:50 PM EDT
[Last Edit: Dyzastr] [#12]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ringer706:
Speaking of newly acquired PEQ-2's, I was finally able to get mine today! Craziest thing, a buddy just got back from what he called a vacation and said he had a few spares lying around. Go figure...

For legal reasons I must clarify that the above statement is a joke. I did get it today, but from an entirely legitimate source.

https://i.imgur.com/nSZMd8i.jpg
View Quote
Very nice. I really dig the earlier m962's. I didn't think peq2's were ever available to civilians? I'd call it a semi legitimite source.
Link Posted: 8/27/2021 10:50:51 PM EDT
[Last Edit: Dyzastr] [#13]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FastCar:
I know the Tan Anodized Colt Buffer tube is not Clone correct, but i want to do it so bad.
Would you guys flame me for that OR approve it?


OR

Should i stick with the black buffer tube since everything else is clone correct right down to my Tan Gen 1 LMT Buttstock ?
View Quote
Ya, stick with black. The novelty wears off fast. Not to mention they've doubled in price since a year or two ago. If you must get one, just throw it on a non clone build. Dilemma solved.

Eta-pics for pics sake
found another m68 on a block2. Not sure if posted yet (probably was)
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“Friends don’t let friends use anything other than black anodized 4 pos receiver extensions.”
Link Posted: 8/29/2021 3:45:42 PM EDT
[Last Edit: Dyzastr] [#14]
What's the deal with these cheaper "mk12" gas blocks from Potomac armory? Anyone have any experience or knowledge on these?

Mk12 GB Potomac armory
(I know, I know, I should avoid linked site, I'm just curious about the gas blocks.)
Link Posted: 8/29/2021 4:31:59 PM EDT
[#15]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
What's the deal with these cheaper "mk12" gas blocks from Potomac armory? Any have any experience or knowledge on these?

Potomac mk12 GB
(I know, I know, I should avoid linked site, I'm just curious about the gas blocks.)
View Quote
If it's from Charlie's, who knows.
Link Posted: 8/29/2021 5:44:24 PM EDT
[#16]
Very interesting
Attachment Attached File

Link Posted: 8/29/2021 5:55:08 PM EDT
[#17]
Discussion ForumsJump to Quoted PostQuote History


Oh fuck, it’s reeeeaaaaalllllll. DD MK18 marked uppers.
Link Posted: 8/29/2021 6:11:13 PM EDT
[#18]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By -KentuckyWindage-:


Oh fuck, it's reeeeaaaaalllllll. DD MK18 marked uppers.
View Quote
Not just marked by DD either, peep the crane serial.
Link Posted: 8/29/2021 6:18:39 PM EDT
[#19]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
Not just marked by DD either, peep the crane serial.
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Originally Posted By LsuJon:
Originally Posted By -KentuckyWindage-:


Oh fuck, it's reeeeaaaaalllllll. DD MK18 marked uppers.
Not just marked by DD either, peep the crane serial.

HTF can you even read anything? All I can see is that there's something there. If I didn't know it said "DDMk18", I'd be clueless.
Link Posted: 8/29/2021 6:30:19 PM EDT
[Last Edit: Dyzastr] [#20]
Discussion ForumsJump to Quoted PostQuote History
I'm sorry but I can't read anything after being blinded by those CQB Hot Pants! Eyes forever unclean!

Eta-thread is about to flooded with DD factory uppers and I told you so’s. Brace yourselves.
Link Posted: 8/29/2021 6:46:13 PM EDT
[#21]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:

HTF can you even read anything? All I can see is that there's something there. If I didn't know it said "DDMk18", I'd be clueless.
View Quote
I think when you upload it's via mobile you loose some quality. On my phone I can make out most of the serial number lol
Link Posted: 8/29/2021 6:55:04 PM EDT
[#22]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
I think when you upload it's via mobile you loose some quality. On my phone I can make out most of the serial number lol
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Originally Posted By LsuJon:
Originally Posted By SecretSquirell:

HTF can you even read anything? All I can see is that there's something there. If I didn't know it said "DDMk18", I'd be clueless.
I think when you upload it's via mobile you loose some quality. On my phone I can make out most of the serial number lol

Ah, yeah, they're definitely not that high of resolution on my end.
Link Posted: 8/29/2021 7:06:35 PM EDT
[#23]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
I'm sorry but I can't read anything after being blinded by those CQB Hot Pants! Eyes forever unclean!

Eta-thread is about to flooded with DD factory uppers and I told you so’s. Brace yourselves.
View Quote

LOL Those hot pants are what we called UDT shorts.  What the SEALs used to wear and what we wore in the Fleet Marines for PT and water OPs.  I still have mine but do not wear them and no I won't try them on for you and take a pic either.  Sorry no CQBR in the pic.
UDT Glamour Shot
Link Posted: 8/29/2021 7:08:17 PM EDT
[#24]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By imdBman:

LOL Those hot pants are what we called UDT shorts.  What the SEALs used to wear and what we wore in the Fleet Marines for PT and water OPs.  I still have mine but do not wear them and no I won't try them on for you and take a pic either.  Sorry no CQBR in the pic.
UDT Glamour Shot
View Quote
More of a silkies guy myself but yes guy on the right is NSW and the left is army EOD
Link Posted: 8/29/2021 7:55:02 PM EDT
[#25]
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Originally Posted By LsuJon:
Not just marked by DD either, peep the crane serial.
View Quote



This might just be pic of the year, well done Sir.
Link Posted: 8/29/2021 8:18:06 PM EDT
[Last Edit: bimmertech87] [#26]
What’s the best option for a correct ambi colt safety? Anyone have a lead on one?
Link Posted: 8/29/2021 9:43:55 PM EDT
[#27]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By -KentuckyWindage-:
This might just be pic of the year, well done Sir.
View Quote
Link Posted: 8/29/2021 10:57:43 PM EDT
[#28]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By imdBman:

LOL Those hot pants are what we called UDT shorts.  What the SEALs used to wear and what we wore in the Fleet Marines for PT and water OPs.  I still have mine but do not wear them and no I won't try them on for you and take a pic either.  Sorry no CQBR in the pic.
UDT Glamour Shot
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Originally Posted By imdBman:
Originally Posted By Dyzastr:
I'm sorry but I can't read anything after being blinded by those CQB Hot Pants! Eyes forever unclean!

Eta-thread is about to flooded with DD factory uppers and I told you so's. Brace yourselves.

LOL Those hot pants are what we called UDT shorts.  What the SEALs used to wear and what we wore in the Fleet Marines for PT and water OPs.  I still have mine but do not wear them and no I won't try them on for you and take a pic either.  Sorry no CQBR in the pic.
UDT Glamour Shot
So you're sayin you won't slide into my DM's with a cqb hot pants pic?
Link Posted: 8/30/2021 1:43:30 AM EDT
[#29]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By jake-cutter:
Has anyone received an update or their order for the Surefire 4 prong flash hider from Euro Optics?
View Quote


I came here looking for the same info. I’m going email them tomorrow. I’d like an update too.
Link Posted: 8/30/2021 2:45:15 AM EDT
[Last Edit: Dyzastr] [#30]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Theodoric:
If it's from Charlie's, who knows.
View Quote
I did some more checking. So despite ccc saying that these are 100% identical to the DD and badger gas blocks, they are not. DD and badger use 416 stainless steel, and these ones from Potomac are chrome moly vanadium tool steel.
Link Posted: 8/30/2021 3:01:56 AM EDT
[#31]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By bimmertech87:
What's the best option for a correct ambi colt safety? Anyone have a lead on one?
View Quote
Brownells has them from time to time.

Mine doesn't like being used w/ a colt trigger though. Causes the bolt to hang on the hammer while racking it on safe.
Link Posted: 8/30/2021 4:00:01 AM EDT
[Last Edit: Combat_Diver] [#32]
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15 years wearing UDTs as a uniform

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CD
Link Posted: 8/30/2021 7:03:41 AM EDT
[Last Edit: bimmertech87] [#33]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
Brownells has them from time to time.

Mine doesn't like being used w/ a colt trigger though. Causes the bolt to hang on the hammer while racking it on safe.
View Quote

Thanks. I plan on using a geissele ssa-e so hopefully no issues.

Any reason a neutered 3 position won’t work? Looks like there are a few in the EE
Link Posted: 8/30/2021 12:05:34 PM EDT
[Last Edit: Tyrant556] [#34]
Combo progress.... thanks CD and @Dyzastr for the inputs earlier...

replaced the MK18's Fixed FS with KAC 99051 (black)... next is to have it's own SF M300C WML.



Stole my PA ACSS LPVO from my other rifle for the Block II...not sure if this is clone acceptable (for now)...
Is the A2 Flash Hider clone correct on the Block II or should I use the KAC NT4 FH? I have one reserved for the planned MK18 Mod 0.

Link Posted: 8/30/2021 12:31:41 PM EDT
[Last Edit: Combat_Diver] [#35]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Tyrant556:
Combo progress.... thanks CD and @Dyzastr for the inputs earlier...

replaced the MK18's Fixed FS with KAC 99051 (black)... next is to have it's own SF M300C WML.

https://i.imgur.com/UjSrvBl.jpg

Stole my PA ACSS LPVO from my other rifle for the Block II...not sure if this is clone acceptable (for now)...
Is the A2 Flash Hider clone correct on the Block II or should I use the KAC NT4 FH? I have one reserved for the planned MK18 Mod 0.

https://i.imgur.com/2nB0NXi.jpg
View Quote


A2 is not clone correct, its either NT4 or SF4P.  Now I do know of a SF battalion armorer who did put A2s as he was out of SF4Ps (3 support guns) and they were headed my way where I did have SF4Ps and fixed.  This was during the change to URGI's.  Teams got the new URGI stuff and BN support guys had their Block 1.5s get upgraded to Block IIs.  So during the swap, he ran short a few FHs.

That said, just went thru 2700+ pics (twice cause I missed it the first time and know I had it) for you and found it.
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CD
Link Posted: 8/30/2021 1:01:45 PM EDT
[Last Edit: Tyrant556] [#36]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Combat_Diver:


A2 is not clone correct either NT4 or SF4P.  Now I do know of a SF battalion armorer who did put A2s as he was out of SF4Ps (3 support guns) and they were headed my way where I did have SF4Ps and fixed.  This was during the change to URGI's.  Teams got the new URGI stuff and BN support guys had their Block 1.5s get upgraded to Block IIs.  So during the swap, he ran short a few FHs.

That said, just went thru 2500+ pics for you and found it.
https://www.ar15.com/media/mediaFiles/32677/IMG_0019_JPG-2071943.JPG


CD
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Originally Posted By Combat_Diver:
Originally Posted By Tyrant556:
Combo progress.... thanks CD and @Dyzastr for the inputs earlier...

replaced the MK18's Fixed FS with KAC 99051 (black)... next is to have it's own SF M300C WML.

https://i.imgur.com/UjSrvBl.jpg

Stole my PA ACSS LPVO from my other rifle for the Block II...not sure if this is clone acceptable (for now)...
Is the A2 Flash Hider clone correct on the Block II or should I use the KAC NT4 FH? I have one reserved for the planned MK18 Mod 0.

https://i.imgur.com/2nB0NXi.jpg


A2 is not clone correct either NT4 or SF4P.  Now I do know of a SF battalion armorer who did put A2s as he was out of SF4Ps (3 support guns) and they were headed my way where I did have SF4Ps and fixed.  This was during the change to URGI's.  Teams got the new URGI stuff and BN support guys had their Block 1.5s get upgraded to Block IIs.  So during the swap, he ran short a few FHs.

That said, just went thru 2500+ pics for you and found it.
https://www.ar15.com/media/mediaFiles/32677/IMG_0019_JPG-2071943.JPG


CD


Awesome, thanks CD!!!

I will replace the A2 FH today with the NT4 FH....and perhaps later with SF4P.
Link Posted: 8/30/2021 1:10:57 PM EDT
[#37]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Tyrant556:


Awesome, thanks CD!!!

I will replace the A2 FH today with the NT4 FH....and perhaps later with SF4P.
View Quote


@Tyrant556

On second thought don't do swap a NT4 on it as its a DD M4A1 RIS II FSB that only the Army used.  MARSOC never used that rail and they're the only ones with NT4s.  Keep it A2 until you get a SF4P.

CD

Link Posted: 8/30/2021 1:16:42 PM EDT
[Last Edit: Tyrant556] [#38]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Combat_Diver:


@Tyrant556

On second thought don't do swap a NT4 on it as its a DD M4A1 RIS II FSB that only the Army used.  MARSOC never used that rail and they're the only ones with NT4s.  Keep it A2 until you get a SF4P.

CD






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Originally Posted By Combat_Diver:
Originally Posted By Tyrant556:


Awesome, thanks CD!!!

I will replace the A2 FH today with the NT4 FH....and perhaps later with SF4P.


@Tyrant556

On second thought don't do swap a NT4 on it as its a DD M4A1 RIS II FSB that only the Army used.  MARSOC never used that rail and they're the only ones with NT4s.  Keep it A2 until you get a SF4P.

CD









Okay CD, will keep the A2 on it for now until I get another SF4P...

BIG Thanks to you brother!!!
Link Posted: 8/30/2021 4:06:27 PM EDT
[Last Edit: Dyzastr] [#39]
Some more nt4 love

Pic probably posted a thousand times, still badass. I had that mag/optic combo for a while. Kinda miss it.Attachment Attached File



ta01nsn on a block1. I've also seen this pic many, many times before, but never noticed the dude in the foreground. Is he holding mary ju wanna? Bonus points for cqd vfg!
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Link Posted: 8/30/2021 8:02:25 PM EDT
[#40]
Link Posted: 8/30/2021 8:21:13 PM EDT
[#41]
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven’t built uppers so I’m clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
Link Posted: 8/30/2021 8:39:00 PM EDT
[#42]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By RevTEG:
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven’t built uppers so I’m clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
View Quote

Usually, the port in the gas block is significantly larger than the port in the barrel so some misalignment isn't detrimental. You can plug one end of the barrel and blow into the other end of the barrel with the gas block installed. If you can easily pass air, you'll probably be alright.
Link Posted: 8/30/2021 8:41:26 PM EDT
[Last Edit: Dyzastr] [#43]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By RevTEG:
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven't built uppers so I'm clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
View Quote
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a malfunction if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
If so, it could cause the gas key to be misaligned with the gas tube which would cause a stoppage.
Attachment Attached File
Link Posted: 8/30/2021 8:48:51 PM EDT
[#44]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a potential disaster if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
https://www.ar15.com/media/mediaFiles/471387/BCCBA74C-6052-443A-9A3E-E918FD18EC1A_jpe-2072507.JPG
View Quote View All Quotes
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Originally Posted By Dyzastr:
Originally Posted By RevTEG:
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven't built uppers so I'm clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a potential disaster if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
https://www.ar15.com/media/mediaFiles/471387/BCCBA74C-6052-443A-9A3E-E918FD18EC1A_jpe-2072507.JPG

I guess I mis-read the "gas tube hole" part. I was thinking barrel gas port. Doh!
Link Posted: 8/30/2021 8:50:41 PM EDT
[#45]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:

I guess I mis-read the "gas tube hole" part. I was thinking barrel gas port. Doh!
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:
Originally Posted By Dyzastr:
Originally Posted By RevTEG:
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven't built uppers so I'm clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a potential disaster if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
https://www.ar15.com/media/mediaFiles/471387/BCCBA74C-6052-443A-9A3E-E918FD18EC1A_jpe-2072507.JPG

I guess I mis-read the "gas tube hole" part. I was thinking barrel gas port. Doh!
I had to reread it after reading your post. I thought maybe I misunderstood too. That's why pics are important. We no read so good.
Link Posted: 8/30/2021 8:54:58 PM EDT
[#46]
Discussion ForumsJump to Quoted PostQuote History
Im digging those noveske builds. The uppers sell too fast whenever they pop up. On a somewhat related note, Is sig ever going to release that suppressor cage deal? I've only seen a few images. Do you know if they scrapped that idea?
Link Posted: 8/30/2021 8:55:32 PM EDT
[#47]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
I had to reread it after reading your post. I thought maybe I misunderstood too. That's why pics are important. We no read so good.
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Originally Posted By Dyzastr:
Originally Posted By SecretSquirell:
Originally Posted By Dyzastr:
Originally Posted By RevTEG:
I have a question that may require a pic, but here goes.

I bought a surplus C marked stripped upper. When I took it to my gun smith he said the gas tube hole is off centered and appeared to have been enlarged. He felt like it could potentially cause reliability issues. I build out my own lowers but I haven't built uppers so I'm clueless. Can the gas tube hole be to large/off centered cause issues?

Thanks
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a potential disaster if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
https://www.ar15.com/media/mediaFiles/471387/BCCBA74C-6052-443A-9A3E-E918FD18EC1A_jpe-2072507.JPG

I guess I mis-read the "gas tube hole" part. I was thinking barrel gas port. Doh!
I had to reread it after reading your post. I thought maybe I misunderstood too. That's why pics are important. We no read so good.

I hit things with hammers and burn them with torches for a living, reading comprehension isn't a critical skill.
Link Posted: 8/30/2021 9:48:55 PM EDT
[#48]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
You want the gas tube to be basically held in place by the hole in the receiver so that there is positive engagement every time the bcg comes back. If the gas tube hole is too big, it can cause alignment issues when the bcg comes flying back in. That could lead to a malfunction if the gas key on the bcg misalign with the gas tube on its way back to the chamber.

Just to make sure, is this the hole you are referring to?
If so, it could cause the gas key to be misaligned with the gas tube which would cause a stoppage.
https://www.ar15.com/media/mediaFiles/471387/BCCBA74C-6052-443A-9A3E-E918FD18EC1A_jpe-2072507.JPG
View Quote


Thanks for the reply. Yes, that’s the hole I’m referring to. My apologies for not posting a pic. I think my post count isn’t high enough yet? So, the gas tube hole on the upper I received is off centered with the “x” shape being almost worn into a circle. It’s much larger than my new uppers. The gas tube doesn’t make any contact. If that makes sense? My Gun Smith wouldn’t install it because he didn’t trust it. He felt like the hole had been drilled out in an attempt to “correct” some of the misalignment.  

For an update, the company I purchased it from is willing to exchange it for me. So that’s cool.
Link Posted: 8/30/2021 9:50:26 PM EDT
[#49]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Dyzastr:
I had to reread it after reading your post. I thought maybe I misunderstood too. That's why pics are important. We no read so good.
View Quote


Thank you for the help. My apologies for not including pics. I’m a newb and think my post count may be to low to post pics?
Link Posted: 8/30/2021 11:03:55 PM EDT
[#50]
Stolen from Ig.
Check out the Roti Wmx placements and SW mounts. Ngals sprinkled throughout.
Cool stuff.



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