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Posted: 10/10/2009 11:35:03 AM EDT
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Similar to an earlier post, except, mine does it after firing. I can get about 2-3 rounds down range, then it sticks. Bolt will not come back no matter how hard I pull on the charging handle. Once I disassemble the rifle and look at the bolt, it appears that the bolt face is not "turning" enough to get the lugs to line up with the corresponding grooves in the barrel. Sorry if nomenclature is not correct.
This happens with store bought and reloads. Any suggestions would be appreciated. |
| Either barrel slipped in the upper receiver barrel socket when it was being tightened/installed (look at the center of the feed ramps to the center of the front take down pin to see if it's canted) and the barrel lugs are out of time, or the bolt or cam was produced out of spec, not allowing the bolt to rotate correctly for disengagement. |
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Quoted:
I'd scrub that chamber clean, then do the same for the BCG. Dirty chambers will stick rounds. Ars need to run wet too. A dry BCG will not run. Thanks. I will admit, that I have not cleaned the actual chamber ( i have yet to buy a chamber brush) in about 1500 rounds (that's all that the gun has been shot) , but I would think that it could take that kind of abuse without needing cleaning. I do clean the weapon after every trip to the range, just not the chamber. I run this gun pretty wet, I am not stingy when it comes to lube. |
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Quoted:
Either barrel slipped in the upper receiver barrel socket when it was being tightened/installed (look at the center of the feed ramps to the center of the front take down pin to see if it's canted) and the barrel lugs are out of time, or the bolt or cam was produced out of spec, not allowing the bolt to rotate correctly for disengagement. I have attached a few pictures just to make sure I am not missing something. Also, a little more history. The weapon is a BCM complete upper with LT rail and BCM BCG, all purchased about a year ago with about 1500-1700 rounds fired. I clean the weapon after every trip to the range, except the last. I disassemble the BCG completely and clean and lube. This problem only started about 100-200 rounds ago. It will shoot 1 or 2 rounds fine then just "lock-up". It was only at my last trip to the range that I really looked closely at the BCG and found that the lugs were not alined correctly. Again, thanks for the input. 
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Edge of the channel at ejector on the bolt face,
Edges of the grabbing claw on the extractor, and the releif channel ends as well on the same, Edges of the barrel extension feed ramps, and the bottom edges of the mag feed lips as well. Tools of choice, small jewelers barrel file, a stone (norton), and even 400 wet/dry sand paper. |
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