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Old 07-15-2013, 12:39 AM
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lwbyo1 lwbyo1 is offline
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Loaded, blocked pmags won't lock in when the bolt is closed. That's why I asked some of those questions. I thought that might be your problem.

Is that a new mag catch installed in the picture above? If so, you are correct that it doesn't look like it's protruding into the mag well far enough. If it's the old one just put in for the picture, then maybe it's your mag catch that's out-of-spec. You need to measure the depth of the mag catch pocket to make sure.

You could also call up your local gun shop and see if they carry AR10 mag catches. They're curved a little and protrude further into the mag well than the AR15 ones. If they do, take your lower and mags there and ask if they'll let you try one to see if it fixes your problem.
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