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Discussion Starter #1
Hey guys. I was looking at G3 parts kits and thinking of building my own. I know I need a tig welder as well as a 5 ton shop press to press the barrel into the trunion. I was contemplating for my first build just using a prebent PTR receiver. I know this requires skill and my dad has used a mig welder for a long time so I'm sure a tig is not much different. Is there a guide here somewhere on how to build one of these? Really wanna try it myself but I'm a little nervous.
 

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I,d be nervous to,considering that a PTR rec. costs $235 ,barrels $200 and one wrong move and down the drain goes a receiver and possibly a damaged barrel/trunion. All the precise stuff like barrel pin hole drilling size and barrel alignment would not be something you can do your first attempt. I,m like ODDBALL in Kelly,s hero,s" I just drive em,I don,t know what makes em work"BUT you gotta learn somehow; I guess LOL roll the dice bro ,If your feelin frisky. I leave it up to the ghillieman myself.But I think your smart enough to take your time and go slow with it,there is plenty of info here. But,weapons guild is where you will get builders experiences or military firearm.com.Let us know and I,m sure ghillie could steer you thru some of it.
 

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Discussion Starter #3
Ghillie built my MP5. And he does a fine job. But I really wanna give this a go myself. Just not 100% on the specs. Like how far to push the barrel into the trunion, barrel pin size etc.
 

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Go for it! Many of us have done it. Weaponsguild.com has more resources concerning Weapons building then our forum but do a search. Good luck have fun....
 

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You have a newer kit or something? All the old kits had the barrels already in the trunnions ready to reweld into a new receiver... they were a snap. The biggest problem with them was jigging everything up right so the cocking tube and front sight didn't twist off on a weird angle when welded. Easy as pie.
 

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TEOTWAWKI is a Filipino martial art popular among Preppers....
I thought it was a REM song?

Anyway, Tiggin' aint easy, but with practice you can do it. I still suck at it but try to use it at least twice a month to stay on top of it. lol. You can do it if i can. Weaponsguild is a sick site full of amazing builds that will make you want to build crazy stuff, but there is tons of info there. I am building a 40cal k clone that uses suomi drums I am converting to 40cal cause of that site. WTF? Great place tho
 

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Discussion Starter #7
Shattered, I don't currently have a kit. I was looking at rtg and they have cocking tube and trunion assemblies. I can't really find any G3 kits. I used to see them all over the place. So my plan was to piece meal one together.
 

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What Shattered is saying,is to try and find a trunnioned barrel.Then,all you have to do is jig it up and weld it in the rec.,then you wont have to do any barrel pinning or headspacing and most of all;YOu WONT NEED A PRESS. The cocking tube weld is very easy to burn thru because the metal is very thin, but I,m sure you can take your time and get it right the first time.Cocking tubes are CHEAPER than Receivers,you know what i mean?
 

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What Shattered is saying,is to try and find a trunnioned barrel.Then,all you have to do is jig it up and weld it in the rec.,then you wont have to do any barrel pinning or headspacing and most of all;YOu WONT NEED A PRESS
As long as you have bolt gap that's in spec. All the surplus kits with barreled trunnions I came across(mostly FMP) had zilch in the way of bolt gap, even with +4 rollers installed. Maybe I had bad luck, but you should be aware of this.

Another thing to consider: use a decent quality welding machine. Be prepared to spend some money. If you go cheap, you may end up with some U-G-L-Y welds. Don't ask me how I know.

Use a goodly amount of heat stop paste in the roller recess of the trunnion while welding. My machine(Oh, I love it so) went ape-sh.t on me during my 4th build and overheated the trunnion on one side. It annealed the trunnion and the gun completely lost bolt gap in short order. I'd have saved myself the price of a new trunnion and barrel, as well as the hours of removing the ruined parts and installing new ones if I had just used some heat stop paste.

If you do end up pressing and pinning a barrel on your own, check out these threads: http://www.hkpro.com/forum/hk-clone...oversize-barrel-pin-question-what-limits.html

http://www.hkpro.com/forum/hk-clone-talk/133928-hk91-trunnion-barrel-pin-specs-needed.html
 

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Discussion Starter #10
Awesome. Thanks guys. I definitely think I can do it. I'll let y'all see the final product when I pick everything up.
 
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