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Old 07-12-2018, 07:29 AM   #1
JTM20
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Default Do I Need a New Barrel?

After screwing-up while headspacing my Tantal build, i need to replace the front trunnion and bolt (locking lugs are toast and it's a nonmatching kit). Problem is i already drilled the barrel pin channel on the barrel.

Do i need a new barrel once i replace these parts? I'm thinking yes since they probably won't headspace the same, but I'm wondering if i can save it.
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Old 07-12-2018, 07:42 AM   #2
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Install the barrel and then determine if it will headspace., or if an oversized pin or a weld bead in the pin channel will resolve any headspace issue.
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Old 07-12-2018, 10:44 AM   #3
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How did you manage to toast a bolt and trunnion?
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Old 07-12-2018, 11:45 AM   #4
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Quote:
Originally Posted by def90 View Post
How did you manage to toast a bolt and trunnion?
Ground off too much material trying to adjust headspace that was too tight after pinning the barrel. Turned out i just forgot to ream the barrel pin hole.

I probably went through the surface hardening and don't want to risk it.

Last edited by JTM20; 07-12-2018 at 11:51 AM.
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Old 07-12-2018, 12:19 PM   #5
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Quote:
Originally Posted by def90 View Post
How did you manage to toast a bolt and trunnion?
Me. Dremil showed up
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Old 07-12-2018, 02:34 PM   #6
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You ground on the trunion and the bolt??
Ouch.

Post some pics to see how bad it really is.
Trunion might be fixable.

Yes the barrel pin slot is likely in the wrong place.

I don't weld those. A bunch of other guys will be along to say it's ok.
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Old 07-13-2018, 11:35 AM   #7
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I wouldn't show pics of that. You will get made fun of. Just learn not to do that again ;-)
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Old 07-13-2018, 11:59 AM   #8
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It has become an expensive environment to join the learning curve with AKs. It’s a dying hobby unfortunately. The files will become mostly news, politics and religion with prying eyes.

Sad days.
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Old 07-13-2018, 12:10 PM   #9
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Yea, can't imagine anyone grinding off the lugs to set headspace. No way there was any research done on that method. If I were you I would sell everything as a kit and recoup as much as you can then go buy an AK before you kill yourself. Make sure the pointy end faces away from you.
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Old 07-13-2018, 12:11 PM   #10
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Quote:
Originally Posted by JTM20 View Post
Ground off too much material trying to adjust headspace that was too tight after pinning the barrel. Turned out i just forgot to ream the barrel pin hole.

I probably went through the surface hardening and don't want to risk it.
Quote:
Originally Posted by 1biggun View Post
You ground on the trunion and the bolt??
Ouch.

Post some pics to see how bad it really is
.
Trunion might be fixable.

Yes the barrel pin slot is likely in the wrong place.

I don't weld those. A bunch of other guys will be along to say it's ok.
Oh... I'd like to see photos too.. Just for learning reference what not to do.. Please post photos!
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Old 07-13-2018, 01:00 PM   #11
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Dont grind on a bolt or breech block to even the lugs out. I assume they needed lapped in.
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Old 07-13-2018, 01:13 PM   #12
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Not overly relevant in this case, but giving the barrel a quick push forward has helped me slightly loosen headspace, and ensure the barrel is where it will be after firing some rounds.

How tight was the headspace?
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Old 07-13-2018, 01:39 PM   #13
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A trunion might be able to be remachined by some one depending how bad it is.

No point of making fun or insulting a guy. He's asking for help.

Post up some pics.
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