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Posted: 3/21/2012 9:56:59 AM EDT
| I had a professional gunsmith fit a barrel to a trunnion, and then he headspaced my bolt to the barrel. I attached the trunnion to my receiver, and then pressed the barrel in. Would the head space change during this process? I did check the "go no-go" gauges after completion, the "go" fits nice, but the "no go" seems tight but it appears to have closed. any suggestions? |
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If it closes on the no go, then you have a problem.
Re-headspace for close with the go, and no close on the no go. Then ream an oversize hole .300", and pin it with a .302" pin from AK-builder. This is the safest and correct way to do it. ETA: professional gunsmith does not necessarily mean he's an AK builder. My father in law is a gunsmith. The ONLY thing I let him do with my builds is the refinishing and transfers. |
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Quoted:
The professional I mentioned does build AK 47s. I will try the field guage before taking apart. It closes on the "GO" and is real tight on the "NO-GO" If it's really tight on the no-go then you're fine. All of our head spacing in the armory were done with the field gauge only, since that's all that really mattered safety wise. And that was for a pre-fire inspection. |
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Quoted:
The professional I mentioned does build AK 47s. I will try the field guage before taking apart. It closes on the "GO" and is real tight on the "NO-GO" You should not be applying alot of pressure when using HS gauges, dont force it closed. Gentle thumb pressure is fine. |
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A little give is OK on a no-go, as long as it doesn't move very far. When I first got my gauges I tried them on all of my factory AKs. Some were very tight to the point of no rotation at all, others were a quarter turn before meeting resistance on nearly new rifles.
As others have said, finger pressure on the bolt is OK to gauge it, you don't want or need the force of the carrier or spring to judge fit. Tighter is generally better than loose as you can always lap it if there are problems extracting. |
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