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Posted: 1/15/2007 12:15:31 PM EDT
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After around 100rnds with any upper on this lower, the bolt will start slowing down and not having the strength to push the round forward. I think its rubbing on the feed lips of the magazines. Basically as soon as the lube is burned off it quits on me, even with a piston upper with no carbon entering the system, but without the lube it just shuts down. With the magazine removed bolt moves much more freely. This problem does not happen with the same uppers on different lowers. I am thinking I am just going to have to replace the lower as I guess its out of spec.  Any thoughts? |
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You might want to strip down the follow out of a mag, and see if the mag feed lips are the items binding, or just the additional tension of the follower off the bottom of the carrier (which is normal). As for the CLP burn off problem, Confirm that the key is not the problem with it binding down the upper receiver track, The tail of the hammer being too long with it wedging between the bottom of the carrier and the upper side of the disco/trigger rear (will be a dent/line behind the hook if this is happening), An end of recoil spring bur that is scrapping down the inside of the receiver extension, Or just the hammer catching the FP collar on the forward stroke slowing it down. |
Thanks, I checked without a follower in and it moved freely. It seems to be getting really badly hung up on the follower. I thought it might be the bolt hold open, so I took that out, but that wasnt the problem. I checked for wear on the hammer and in the reciever extension, none evident. It easily cycles back, and is actually chambering rounds all the way in, it just doesnt have the power to seat around them fully. |
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