AK bolt lock up trouble

[Alex$]

Good evening gents, serial matching Polish kit, American made barrel.

Everything with headspace and barrel pin was fine, positive lock up with no trouble, both GO lock and NO-GO unlock. Checked 4 times before drilling cross pin hole, checked fine after drilling.

Do final assembly, now it fails lock up. Issue started with bolt locking in place and had to use a rubber mallet to get it to unlock.

Now it will not lock up unless it is beat in and back out.

Trouble shooting I pull out one of my other bolts, it has no issues at all, cycles just fine with positive lock up.

How to trouble shoot now? The bolt appears to be fine, no burrs or anything in the locking recesses.

Stripped bolt will not lock and unlock, what am I missing?

[javithewrench]

Sounds like headspace is too tight unless you damaged the bolt some how

[munkeeboi]

maybe your ejector is too long and is not letting the bolt line up corretly

[Alex$]

Once pinned and the headspace measured as correct, it cannot change dramatically like this.

The only possible explanation I can think of is the assembled barrel was dropped off the table and hit concrete floor on chamber end. I suppose some metal might have been displaced and the bolt is now tight.

Guess I will have to pull the barrel and inspect it, but it doesn't looked boogered.

[javithewrench]

Unless the hole is egg shaped and the barrel is traveling in further than it should. Did you do all the work yourself?