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Thread: AKS-74U over gassing problem
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September 21st, 2020, 10:13 PM #1Active Member
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AKS-74U over gassing problem
I got a Title II Poly-Tech AKS-74U built on a Bulgarian parts kit. It is chambered in 5.45 but was originally a .223/5.56 gun. Here’s the skinny. I have shot it twice in two years. Both times at or about a mag or two I had case head separation. It was a bitch to get out and I mean a bitch. I happen to get the first time on video. The chances of this happening are astronomical. After learning that Poly-Techs originally had gassing issues I had my light bulb moment. I would be looking for a competent gunsmith that could take on said project that is able to have transferred a MG. I would like to keep it in state to save the ATF hassle but beggars can’t be choosers at this point. Any help to point me in the right direction would be greatly appreciated. Thanks.
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September 21st, 2020, 10:22 PM #2Grand Member
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Re: AKS-74U over gassing problem
Case head separation wouldn't be caused by the gas system.
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September 21st, 2020, 10:43 PM #3Active Member
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Everett,
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Re: AKS-74U over gassing problem
Most likely a headspace issue. If you could find someone close to you who builds AK's and had 5.45 gauges they could check it. Or even loan you the gauges to check maybe.
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September 22nd, 2020, 12:03 PM #4
Re: AKS-74U over gassing problem
Headspace. Especially suspect due to the conversion and parts assembly history.
There are two kinds of guns. Those I have acquired, and those I hope to.
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September 22nd, 2020, 12:09 PM #5
Re: AKS-74U over gassing problem
I agree with the others regarding the case head separation. Get a no go gauge and check the head space for yourself.
Regarding any over gassing check out the KNS adjustable gas piston. It does wonders on tuning AK’s.
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September 22nd, 2020, 11:55 PM #6Active Member
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Re: AKS-74U over gassing problem
Thank you guys for your chimes. I*ll get a go no go gage and . I*ll repost once it*s checked. Thank you again.
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September 23rd, 2020, 04:13 AM #7
Re: AKS-74U over gassing problem
Just get a no go and a field. The go is only useful if installing a new barrel
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October 18th, 2020, 12:56 AM #8Active Member
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Re: AKS-74U over gassing problem
Finally got my go no go gages. Placed the no go in the chamber and gun went into battery. I believe I have solved the problem. Now I just need a gunsmith the rectify the issue. Thanks guys.
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October 18th, 2020, 09:29 AM #9
Re: AKS-74U over gassing problem
Well I’m glad you found the issue but it sucks to have that particular issue. I don’t know of any smiths in PA that can deal with it for you. Outside of PA there’s Definitive arms who are AK builders and Smiths, they also deal with NFA items as well.
Good luck and keep us posted.
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October 18th, 2020, 12:15 PM #10
Re: AKS-74U over gassing problem
Weld metal to the rear of the bolt lugs, then dress them down to correct headspace. Calls for correct metal rod, heat-treating, et cetera. Probably makes it not worth it. Sell it to Hollywood as a prop gun.
There are two kinds of guns. Those I have acquired, and those I hope to.
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