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Link Posted: 9/8/2019 1:42:55 PM EDT
[#1]
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Quoted:
Check out usbarrelshrouds.com

They have some mini parts.
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I can vouch for their customer service. Ordered a green Uzi handguard and one of the screws reach one of the holes. I emailed asking if there was a longer screw or if I could exchange.

They replied with a tracking number for a new handguard set. That was a pleasant surprise.
Link Posted: 9/8/2019 5:20:15 PM EDT
[#2]
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Quoted:
I can vouch for their customer service. Ordered a green Uzi handguard and one of the screws reach one of the holes. I emailed asking if there was a longer screw or if I could exchange.

They replied with a tracking number for a new handguard set. That was a pleasant surprise.
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Quoted:
Quoted:
Check out usbarrelshrouds.com

They have some mini parts.
I can vouch for their customer service. Ordered a green Uzi handguard and one of the screws reach one of the holes. I emailed asking if there was a longer screw or if I could exchange.

They replied with a tracking number for a new handguard set. That was a pleasant surprise.
I was gonna order their repair section and my buddy told me RTG had a cheaper one.

Im starting to realize why
Link Posted: 9/8/2019 6:34:39 PM EDT
[#3]
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Quoted:
I was gonna order their repair section and my buddy told me RTG had a cheaper one.

Im starting to realize why
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Check out usbarrelshrouds.com

They have some mini parts.
I can vouch for their customer service. Ordered a green Uzi handguard and one of the screws reach one of the holes. I emailed asking if there was a longer screw or if I could exchange.

They replied with a tracking number for a new handguard set. That was a pleasant surprise.
I was gonna order their repair section and my buddy told me RTG had a cheaper one.

Im starting to realize why
I used their section with no problems, but as stated, I didnt use their jig.

That is pretty crappy that they dont seem to care that their jig that they sell in a kit with their section doesnt work.
Link Posted: 9/9/2019 10:59:45 AM EDT
[#4]
I ended up having a busy weekend with family but I managed to build my HF sandblaster (holy shit that was tedious, worse than their concrete mixer) and I cut the front section and lined it up with the jig. The jig is way too tight in the rear but I'll get to that later.

Attachment Attached File
Link Posted: 9/9/2019 11:17:17 AM EDT
[#5]
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Quoted:
I ended up having a busy weekend with family but I managed to build my HF sandblaster (holy shit that was tedious, worse than their concrete mixer) and I cut the front section and lined it up with the jig. The jig is way too tight in the rear but I'll get to that later.

https://www.AR15.Com/media/mediaFiles/389530/12081356-C4FE-463B-BD7F-DDF7A00A719F_jpeg-1084307.JPG
View Quote
Dude, you need to hurry... the Retro Wave shoot is only a couple of weeks away!

Link Posted: 9/9/2019 11:23:38 AM EDT
[#6]
I built one with a TIG and the RTG jig... Turned out fantastic.  Used an Israeli kit and a German lower.  Had no problems with the jig or the build.  Mine is .45ACP and I used a full auto barrel and original trunnion.

I used a blank receiver channel (no blocking bar)

If you need a working jig, I would lend you mine.

Link Posted: 9/9/2019 1:46:02 PM EDT
[#7]
Couple more pics.

Attachment Attached File


I tried out the HF sandblaster very briefly, I think it'll work fine for me

Attachment Attached File
Link Posted: 9/9/2019 2:01:34 PM EDT
[#8]
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Quoted:
Dude, you need to hurry... the Retro Wave shoot is only a couple of weeks away!

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Quoted:
Quoted:
I ended up having a busy weekend with family but I managed to build my HF sandblaster (holy shit that was tedious, worse than their concrete mixer) and I cut the front section and lined it up with the jig. The jig is way too tight in the rear but I'll get to that later.

https://www.AR15.Com/media/mediaFiles/389530/12081356-C4FE-463B-BD7F-DDF7A00A719F_jpeg-1084307.JPG
Dude, you need to hurry... the Retro Wave shoot is only a couple of weeks away!

Haha I'm going as fast as I can!!  (As fast as I have "spare" time that is)
Link Posted: 9/9/2019 2:02:22 PM EDT
[#9]
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Quoted:
I built one with a TIG and the RTG jig... Turned out fantastic.  Used an Israeli kit and a German lower.  Had no problems with the jig or the build.  Mine is .45ACP and I used a full auto barrel and original trunnion.

I used a blank receiver channel (no blocking bar)

If you need a working jig, I would lend you mine.

https://i.imgur.com/JaWoAOi.jpg
View Quote
That looks great!
Link Posted: 9/9/2019 2:06:31 PM EDT
[#10]
After this do a Swedish K  
Link Posted: 9/9/2019 2:30:01 PM EDT
[#11]
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Quoted:
Use this and remove the blocking bar?

https://www.mckay-ent.com/uzi/uzi-semi-auto-receiver-shell.html
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It was actually really easy just to slot the f/a bolt
Link Posted: 9/10/2019 9:46:33 AM EDT
[#12]
Ok so TIG welding is kinda like soldering, which I am terrible at lol.

This is the first TIG weld of my life, not beautiful but I am still figuring out technique and settings.

Attachment Attached File


It cleaned up super fast though.

Attachment Attached File


And the HF sandblaster works just fine, it's pretty fast actually

Attachment Attached File


Not perfect but I'm good with it for my first try. I also forgot to turn the gas on a couple times which is why there were some pin holes, they don't go all the way through though.
Link Posted: 9/10/2019 9:52:18 AM EDT
[#13]
I got the old lug off the parts kit, took a bit of grinding and I ruined a screwdriver but I got it lol

Attachment Attached File


Attachment Attached File
Link Posted: 9/10/2019 10:11:03 AM EDT
[#14]
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But do you already have the bayonet ready to attach?
Link Posted: 9/10/2019 10:44:16 AM EDT
[#15]
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Quoted:
But do you already have the bayonet ready to attach?
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Quoted:
But do you already have the bayonet ready to attach?
That lug holes the pistol grip and stock on

My front section with the trunnion has a bayonet lug already on it, but I don't have one.  The handguards mount to the bayonet lug so it's still mandatory lol
Link Posted: 9/10/2019 10:57:01 AM EDT
[#16]
Marc Serbu has a video or two doing this.  Rather interesting.


Nevermind already posted.
Link Posted: 9/10/2019 10:59:19 AM EDT
[#17]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Ok so TIG welding is kinda like soldering, which I am terrible at lol.

This is the first TIG weld of my life, not beautiful but I am still figuring out technique and settings.

https://www.AR15.Com/media/mediaFiles/389530/3A071262-E1AE-4170-A42A-FDBD6E1E9BE0_jpeg-1085371.JPG

It cleaned up super fast though.

https://www.AR15.Com/media/mediaFiles/389530/88B42717-64EA-412F-AEA4-394B62A70217_jpeg-1085372.JPG

And the HF sandblaster works just fine, it's pretty fast actually

https://www.AR15.Com/media/mediaFiles/389530/5C3097D0-54DE-4763-8DF3-1129BAB8FA44_jpeg-1085374.JPG

Not perfect but I'm good with it for my first try. I also forgot to turn the gas on a couple times which is why there were some pin holes, they don't go all the way through though.
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Looks great to me!
Link Posted: 9/10/2019 11:14:42 AM EDT
[#18]
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Quoted:
Looks great to me!
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Quoted:
Quoted:
Ok so TIG welding is kinda like soldering, which I am terrible at lol.

This is the first TIG weld of my life, not beautiful but I am still figuring out technique and settings.

https://www.AR15.Com/media/mediaFiles/389530/3A071262-E1AE-4170-A42A-FDBD6E1E9BE0_jpeg-1085371.JPG

It cleaned up super fast though.

https://www.AR15.Com/media/mediaFiles/389530/88B42717-64EA-412F-AEA4-394B62A70217_jpeg-1085372.JPG

And the HF sandblaster works just fine, it's pretty fast actually

https://www.AR15.Com/media/mediaFiles/389530/5C3097D0-54DE-4763-8DF3-1129BAB8FA44_jpeg-1085374.JPG

Not perfect but I'm good with it for my first try. I also forgot to turn the gas on a couple times which is why there were some pin holes, they don't go all the way through though.
Looks great to me!
Thanks dude
Link Posted: 9/10/2019 11:23:59 AM EDT
[#19]
Looks like the gas setting is to high on your welder, you should have no splatter.
Link Posted: 9/10/2019 11:39:00 AM EDT
[#20]
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Quoted:
Thanks dude
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Quoted:
Quoted:
Quoted:
Ok so TIG welding is kinda like soldering, which I am terrible at lol.

This is the first TIG weld of my life, not beautiful but I am still figuring out technique and settings.

https://www.AR15.Com/media/mediaFiles/389530/3A071262-E1AE-4170-A42A-FDBD6E1E9BE0_jpeg-1085371.JPG

It cleaned up super fast though.

https://www.AR15.Com/media/mediaFiles/389530/88B42717-64EA-412F-AEA4-394B62A70217_jpeg-1085372.JPG

And the HF sandblaster works just fine, it's pretty fast actually

https://www.AR15.Com/media/mediaFiles/389530/5C3097D0-54DE-4763-8DF3-1129BAB8FA44_jpeg-1085374.JPG

Not perfect but I'm good with it for my first try. I also forgot to turn the gas on a couple times which is why there were some pin holes, they don't go all the way through though.
Looks great to me!
Thanks dude
Cool to see that you are making progress despite the earlier issues.
Link Posted: 9/10/2019 11:56:34 AM EDT
[#21]
I'm not a welder at all, but I agree that something is off there on that weld, there should be no splatter like a MIG.  What voltage and gas are you running?

You might be using too much pressure on your gas?  Even on a bad TIG weld they're still fairly clean.  I think I ran around 25psi or so on my Argon with a few seconds of post flow.  I also used a 3/32 tungsten ground to a pretty fine point.

Keep in mind as well that it's DC Electrode Negative... if you hook it up backwards, you'll get huge splatter like that.  Don't ask how I know that
Link Posted: 9/10/2019 12:14:02 PM EDT
[#22]
OST.  You may have cost me money.  
Link Posted: 9/10/2019 12:46:18 PM EDT
[#23]
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Quoted:
Looks like the gas setting is to high on your welder, you should have no splatter.
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The spatter was from me forgetting to turn the gas on one time, my cheap welder doesn't have a thumb control or foot pedal it's "scratch" start with a gas knob on the torch.  You have to open the gas knob before you start welding.  That spatter was an isolated incident lol

I don't think the gas being up too high would cause that anyway.
Link Posted: 9/10/2019 12:50:29 PM EDT
[#24]
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Quoted:
Cool to see that you are making progress despite the earlier issues.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Quoted:
Ok so TIG welding is kinda like soldering, which I am terrible at lol.

This is the first TIG weld of my life, not beautiful but I am still figuring out technique and settings.

https://www.AR15.Com/media/mediaFiles/389530/3A071262-E1AE-4170-A42A-FDBD6E1E9BE0_jpeg-1085371.JPG

It cleaned up super fast though.

https://www.AR15.Com/media/mediaFiles/389530/88B42717-64EA-412F-AEA4-394B62A70217_jpeg-1085372.JPG

And the HF sandblaster works just fine, it's pretty fast actually

https://www.AR15.Com/media/mediaFiles/389530/5C3097D0-54DE-4763-8DF3-1129BAB8FA44_jpeg-1085374.JPG

Not perfect but I'm good with it for my first try. I also forgot to turn the gas on a couple times which is why there were some pin holes, they don't go all the way through though.
Looks great to me!
Thanks dude
Cool to see that you are making progress despite the earlier issues.
Oh yeah I cut the blocking bar off and did a little grinding on the jig and it's a nice tight (few smacks with a hammer) fit in and out now (as opposed to the 5 ton press fit it was when I bought it).

My kit didn't have a rear handguard stud or the receiver piece to cut it off of so I ordered one from BWE.

A buddy of mine is trying to talk me out of cutting the rear off and welding on my entire parts kit rear section.  I think cutting the backing plate and rear sight mount off the old one and welding them to this one would be harder than just chopping the rear off and welding the new one on.  Although I don't see how you could use the jig for that since you couldn't get it out after it was welded.
Link Posted: 9/10/2019 12:54:59 PM EDT
[#25]
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Quoted:
I'm not sure if I'm here for the Uzi build or just to watch the oriental girl swallow ice cream over and over....
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In this thread you get both
Link Posted: 9/10/2019 12:56:15 PM EDT
[#26]
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Quoted:
I'm not a welder at all, but I agree that something is off there on that weld, there should be no splatter like a MIG.  What voltage and gas are you running?

You might be using too much pressure on your gas?  Even on a bad TIG weld they're still fairly clean.  I think I ran around 25psi or so on my Argon with a few seconds of post flow.  I also used a 3/32 tungsten ground to a pretty fine point.

Keep in mind as well that it's DC Electrode Negative... if you hook it up backwards, you'll get huge splatter like that.  Don't ask how I know that
View Quote
Spatter explained above, Argon helps lol

For clarification I'm using 2% Ceriated 3/32" tungsten ground sharp (chucked in a cordless drill and ground on a bench grinder).   I think you meant what Amperage am I running (not voltage), this was mostly done at around 35-40A and yes I'm using 100% Argon.  Gas lens with a pyrex cup.

I think next time around I'll bump the amperage and move a little faster, part of the reason for the crappy looking beads is I was waiting too long for a puddle to form because I think the heat was a bit low.  I was probably overly cautious about warpage, especially since it was in a jig.
Link Posted: 9/10/2019 1:02:27 PM EDT
[#27]
My front receiver piece was on the short side, the repair section is plenty long but when I cut the front section to mate up I cut the bottom off not knowing I needed to leave it.

There wasnt enough there to fill this hole even if I didn't cut it off but I didn't help the matter

Attachment Attached File


You can see the piece on the table that I had cut off, one side of that was my cut and the other was the way it came (the short ends (sides) I removed to use it to "patch" this hole.

I could have done this several ways but I wanted more practice with the TIG so I figured welding around this piece would be good for me to try.
Link Posted: 9/10/2019 1:10:04 PM EDT
[#28]
I tacked the front of it and then hammered it into shape to be flush with the hole. Then I just had to fill in around it

Attachment Attached File


There was a decent gap around it, which made it hard for me to weld (a butt joint would have been easier for a newbie I think) but I managed to fill it in.

Again, more heat would have made this cleaner probably.

But once again very little grinding to get it smooth

Attachment Attached File


And a quick trip to the blast cabinet

Attachment Attached File


Once again not what I would call perfect but I'm happy with it for my day TIGing. I'm sure with practice I'll make it look pretty
Link Posted: 9/10/2019 1:17:41 PM EDT
[#29]
I need to buy a welder and learn to use it one of these days. Too many cool projects I could be doing. Great post OP!
Link Posted: 9/10/2019 1:59:27 PM EDT
[#30]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I tacked the front of it and then hammered it into shape to be flush with the hole. Then I just had to fill in around it

https://www.AR15.Com/media/mediaFiles/389530/90AF1A6D-09FF-41D1-8138-632E498F2EEB_jpeg-1085546.JPG

There was a decent gap around it, which made it hard for me to weld (a butt joint would have been easier for a newbie I think) but I managed to fill it in.

Again, more heat would have made this cleaner probably.

But once again very little grinding to get it smooth

https://www.AR15.Com/media/mediaFiles/389530/B9A06B90-DB3A-4DFC-BBC0-312332D9712E_jpeg-1085549.JPG

And a quick trip to the blast cabinet

https://www.AR15.Com/media/mediaFiles/389530/325F3023-7F4C-4E22-AC27-9EA271948D6B_jpeg-1085550.JPG

Once again not what I would call perfect but I'm happy with it for my day TIGing. I'm sure with practice I'll make it look pretty
View Quote
It is stamped sheet metal. With coating, the forearm, and top cover it will look great.

I ran into the same problem while considering welding on a complete rear piece. I was going to make a smaller jig out of aluminum. A good welder could do it. I am not good.

I have a couple of rear receiver stubs in my spare parts box.
Link Posted: 9/10/2019 2:48:43 PM EDT
[#31]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
It is stamped sheet metal. With coating, the forearm, and top cover it will look great.
[/b]
I ran into the same problem while considering welding on a complete rear piece. I was going to make a smaller jig out of aluminum. A good welder could do it. I am not good.

I have a couple of rear receiver stubs in my spare parts box.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
I tacked the front of it and then hammered it into shape to be flush with the hole. Then I just had to fill in around it

https://www.AR15.Com/media/mediaFiles/389530/90AF1A6D-09FF-41D1-8138-632E498F2EEB_jpeg-1085546.JPG

There was a decent gap around it, which made it hard for me to weld (a butt joint would have been easier for a newbie I think) but I managed to fill it in.

Again, more heat would have made this cleaner probably.

But once again very little grinding to get it smooth

https://www.AR15.Com/media/mediaFiles/389530/B9A06B90-DB3A-4DFC-BBC0-312332D9712E_jpeg-1085549.JPG

And a quick trip to the blast cabinet

https://www.AR15.Com/media/mediaFiles/389530/325F3023-7F4C-4E22-AC27-9EA271948D6B_jpeg-1085550.JPG

Once again not what I would call perfect but I'm happy with it for my day TIGing. I'm sure with practice I'll make it look pretty
It is stamped sheet metal. With coating, the forearm, and top cover it will look great.
[/b]
I ran into the same problem while considering welding on a complete rear piece. I was going to make a smaller jig out of aluminum. A good welder could do it. I am not good.

I have a couple of rear receiver stubs in my spare parts box.
That's what I was thinking!

I guess I could get some aluminum bar stock and measure the existing jig and mill it to shape.

If the rear section isn't straight will it bind up the bolt?
Link Posted: 9/10/2019 4:12:27 PM EDT
[#32]
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Quoted:
That's what I was thinking!

I guess I could get some aluminum bar stock and measure the existing jig and mill it to shape.

If the rear section isn't straight will it bind up the bolt?
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
I tacked the front of it and then hammered it into shape to be flush with the hole. Then I just had to fill in around it

https://www.AR15.Com/media/mediaFiles/389530/90AF1A6D-09FF-41D1-8138-632E498F2EEB_jpeg-1085546.JPG

There was a decent gap around it, which made it hard for me to weld (a butt joint would have been easier for a newbie I think) but I managed to fill it in.

Again, more heat would have made this cleaner probably.

But once again very little grinding to get it smooth

https://www.AR15.Com/media/mediaFiles/389530/B9A06B90-DB3A-4DFC-BBC0-312332D9712E_jpeg-1085549.JPG

And a quick trip to the blast cabinet

https://www.AR15.Com/media/mediaFiles/389530/325F3023-7F4C-4E22-AC27-9EA271948D6B_jpeg-1085550.JPG

Once again not what I would call perfect but I'm happy with it for my day TIGing. I'm sure with practice I'll make it look pretty
It is stamped sheet metal. With coating, the forearm, and top cover it will look great.
[/b]
I ran into the same problem while considering welding on a complete rear piece. I was going to make a smaller jig out of aluminum. A good welder could do it. I am not good.

I have a couple of rear receiver stubs in my spare parts box.
That's what I was thinking!

I guess I could get some aluminum bar stock and measure the existing jig and mill it to shape.

If the rear section isn't straight will it bind up the bolt?
In a/an FA most likely. The semi autos have a block of plastic that acts as a buffer. That buffer fills the rear end and can be trimmed to fit.
Link Posted: 9/10/2019 4:17:31 PM EDT
[#33]
Related, I am modifying the hardware to permanently attach a wood buttstock.

How difficult of a project would it be to make a new buttstock? Same shape just about 1-2" longer?
Link Posted: 9/10/2019 5:12:28 PM EDT
[#34]
I'm a little late to the party but I'm in to see more full auto goodness.
Link Posted: 9/10/2019 8:06:13 PM EDT
[#35]
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Quoted:
I'm a little late to the party but I'm in to see more full auto goodness.
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This ^^^

ETA - I have a Vector - but interested in the build to possible build a mini...
Link Posted: 9/10/2019 9:08:52 PM EDT
[#36]
Damn op, you have some huge brass balls to learn Tig welding on a project like that. I have done quite a bit of Tig welding but always do a little bit of practicing with some scrap before going at it.

Link Posted: 9/10/2019 9:13:05 PM EDT
[#37]
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Quoted:
I just got my kit in to build a semi.

I’ll be watching this intently
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2 of us in IA considering a semi build too.
@tobig2handle this might help our plans.
Link Posted: 9/10/2019 9:22:44 PM EDT
[#38]
Anyone got a link to a machining diagram to convert the bolt to semi? Hard to believe all the semi bolts out there are new made, when they give trade credit for FA bolts.
Link Posted: 9/10/2019 11:13:28 PM EDT
[#39]
I recommend practicing on scrap till you get the hang of it.
Link Posted: 9/10/2019 11:24:19 PM EDT
[#40]
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Quoted:
Anyone got a link to a machining diagram to convert the bolt to semi? Hard to believe all the semi bolts out there are new made, when they give trade credit for FA bolts.
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Yeah, I'm wondering about slotting the FA bolt as well.  Do you slot it with a milling machine or what?  I have a Grizzly mini-mill - would that work?
Link Posted: 9/11/2019 7:06:19 AM EDT
[#41]
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Quoted:
I ended up having a busy weekend with family but I managed to build my HF sandblaster (holy shit that was tedious, worse than their concrete mixer) and I cut the front section and lined it up with the jig. The jig is way too tight in the rear but I'll get to that later.

https://www.AR15.Com/media/mediaFiles/389530/12081356-C4FE-463B-BD7F-DDF7A00A719F_jpeg-1084307.JPG
View Quote
Humm,

It makes me wonder if I could take my Vector 4332, fill the dimples with puddy, and then Fill the cavity with resin that way it is a true to spec cast
Link Posted: 9/11/2019 9:00:18 AM EDT
[#42]
I welded in the grip stick lug, got a better feel for the settings on the welder.

Attachment Attached File


This would have looked better but my tungsten got dull and I burned a hole through and had to fill it back in (top right of the weld shown above).

I also chopped off the back of the 80% and started mating up the parts kit rear. Try as I might I still cut a little too much off the 80% but I'll fill it in. Grinder and paint and all that lol
Link Posted: 9/11/2019 10:08:24 AM EDT
[#43]
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Quoted:
Damn op, you have some huge brass balls to learn Tig welding on a project like that. I have done quite a bit of Tig welding but always do a little bit of practicing with some scrap before going at it.

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I've MIG welded quite a bit and I did some research, but you're right it would have been smarter to practice more but I really didn't have any scraps that were similar thickness.
Link Posted: 9/11/2019 10:09:19 AM EDT
[#44]
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Quoted:
Yeah, I'm wondering about slotting the FA bolt as well.  Do you slot it with a milling machine or what?  I have a Grizzly mini-mill - would that work?
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Quoted:
Quoted:
Anyone got a link to a machining diagram to convert the bolt to semi? Hard to believe all the semi bolts out there are new made, when they give trade credit for FA bolts.
Yeah, I'm wondering about slotting the FA bolt as well.  Do you slot it with a milling machine or what?  I have a Grizzly mini-mill - would that work?
You have to anneal the bolt to slot it, they're hard AF.
Link Posted: 9/11/2019 10:26:19 AM EDT
[#45]
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Quoted:
You have to anneal the bolt to slot it, they're hard AF.
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Quoted:
You have to anneal the bolt to slot it, they're hard AF.
Alternatively, they can be ground just fine. Hell, I did one years ago with an angle grinder!

Quoted:
Quoted:
But do you already have the bayonet ready to attach?
That lug holes the pistol grip and stock on

My front section with the trunnion has a bayonet lug already on it, but I don't have one.  The handguards mount to the bayonet lug so it's still mandatory lol
Duhhhhhh. I don't know what I was thinking!

Well, you should still have a bayonet for later... for... reasons. Magdump, then charge and stab the target in the 10-ring. It's the 80s action hero thing to do!
Link Posted: 9/11/2019 10:32:20 AM EDT
[#46]
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Anyone got a link to a machining diagram to convert the bolt to semi? Hard to believe all the semi bolts out there are new made, when they give trade credit for FA bolts.
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That much machining and changing things from the FA bolt counts as "making" the SA bolt in the USA. Laws are weird!

As far as dimensions and such... not really, but it's dead simple (other than the bolt being hardened) and comparison pictures can be found here. The basic dimensions to shoot for are mostly visual... flat on both rails below the ejection port, then weld and build up the front to the same thickness as the original rail. The photos really do tell the whole story.

For the denial/blocking bar, you relieve the bolt to fit.

The hardest part for most people is setting the bolt up properly for facing off the firing pin and drilling the new firing pin channel straight and true.
Link Posted: 9/11/2019 12:39:10 PM EDT
[#47]
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I'm not a welder at all, but I agree that something is off there on that weld, there should be no splatter like a MIG.  What voltage and gas are you running?

You might be using too much pressure on your gas?  Even on a bad TIG weld they're still fairly clean.  I think I ran around 25psi or so on my Argon with a few seconds of post flow.  I also used a 3/32 tungsten ground to a pretty fine point.

Keep in mind as well that it's DC Electrode Negative... if you hook it up backwards, you'll get huge splatter like that.  Don't ask how I know that
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I found out that scratch start TIG welders are notoriously hard to stop cleanly, many people use a brass "spoon" to run the puddle up onto at the end because pulling the torch away removes the gas and can cause spatter.
You really have to pull the torch away fast or it'll "spray" some material around leaving some of that spatter.  Ask me how I know
Link Posted: 9/11/2019 12:40:10 PM EDT
[#48]
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Quoted:

Alternatively, they can be ground just fine. Hell, I did one years ago with an angle grinder!

Duhhhhhh. I don't know what I was thinking!

Well, you should still have a bayonet for later... for... reasons. Magdump, then charge and stab the target in the 10-ring. It's the 80s action hero thing to do!
View Quote
Truer words have never been spoken.
Link Posted: 9/11/2019 12:50:20 PM EDT
[#49]
You are building a full auto Uzi.

Most here could build a full auto ar 15.

Surely yours is legal or we would not be seeing it here.

Please explain to a dumbass what's going on.
Link Posted: 9/11/2019 12:55:38 PM EDT
[#50]
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Quoted:
You are building a full auto Uzi.

Most here could build a full auto ar 15.

Surely yours is legal or we would not be seeing it here.

Please explain to a dumbass what's going on.
View Quote
SOTs walk among us.
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