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Posted: 5/20/2011 6:05:38 PM EDT
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I'm building a non matching romanian kit. I used AKBUILDER go and no go gauges to check the headspace. I stripped the bolt before testing, and cleaned the chamber and bolt face.
The no go gauge would not allow the bolt to lock up. The go gauge would allow the bolt to lock up. The issue is that after the bolt turned (locked), the bolt carrier acted like it was meeting some resistance and needed to be nudged closed. If I turned the gun barrel down and let the carrier go from the open position it closed all the way with no problem. All testing was done without recoil spring or any fire control group. When I removed the gauge, the bolt would lock and the carrier shut without any resistance. Anyone know why the bolt would lock, but the carrier seemed tight? Is there any further testing that I should do? I have never put together a non matching kit, so I am being cautious. |
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Quoted:
I have never put together a non matching kit, so I am being cautious. Unless the matching kits you've had before had the original barrel, you have assembled a non-matching kit. How far the barrel is seated in the trunnion is a key factor in determining the headspace. You said the bolt locks on the go gauge, thats good, and how far open is the carrier? And you said if you turn the rifle barrel down the carrier closes fully on the go guage? I don't see any problems there. |
Set your pin on the set that you have now. Support your trunnion and set up like you were pressing out the barrel and either give the barrel a good whack forward with a hammer or use your press to push it forward ever so slightly...you'll get some resistance and give it a few extra strokes. I've done this with about every build I've ever done to preload it like your first few rounds will do. 
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Unfortunately your description of the carrier being tight doesn't really say enough. Either the bolt locked and the carrier went all the way forward or the bolt didn't lock and the carrier didn't go all the way forward. The bolt and carrier are one system and as such dependent on each other. Headspace is only one variable of the whole equation. Without more details I would be cautious of any suggested fixes for the problem. 
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| You have to remember they are nonmatching items and because so the parts havent worked together and also mated surfaces..... Worn on eachother.... Its good that your headspace is good... Id put it together and shoot it or atleast cycle it till the parts mate a little better... |
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As mentioned above, we need more information. Can speculate, but the key is to determine where the carrier is rubbing, and why. It could me something minor like a burr. Or it could be something significant.
Some less common things to look at are the upper right section of the trunion where the receiver wraps over, and the ramp angle on the side of the bolt that clears the ejector. These are areas that will not show with the bolt out of the carrier. Try it without the gas cylinder and see if there is enough wiggle to find the gas block. A misaligned gas block - or RSB as you have suggested - can also cause friction. |
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Quoted:
I'm building a non matching romanian kit. I used AKBUILDER go and no go gauges to check the headspace. I stripped the bolt before testing, and cleaned the chamber and bolt face. The no go gauge would not allow the bolt to lock up. The go gauge would allow the bolt to lock up. The issue is that after the bolt turned (locked), the bolt carrier acted like it was meeting some resistance and needed to be nudged closed. If I turned the gun barrel down and let the carrier go from the open position it closed all the way with no problem. All testing was done without recoil spring or any fire control group. When I removed the gauge, the bolt would lock and the carrier shut without any resistance. Anyone know why the bolt would lock, but the carrier seemed tight? Is there any further testing that I should do? I have never put together a non matching kit, so I am being cautious. I check my headspace without the carrier first , this gives you a better visual of how the bolt is closing or not closing. |
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