You have an RRA AR15 that had no unusual problems seating fully-loaded 30rd D&H mags with Magpul followers with the bolt closed. You disassembled the rifle and now the mags do not seat with more than ten rounds in them?
Correct. Rifles don't just magically stop working while they're sitting in the cabinet, so I assume I've screwed something up at some point, I just don't know what, so I can't fix it.
Have you tried using the magazines in another AR15 or disassembling the mags to see if there are any obvious issues there?
I don't have another AR, but if I can't otherwise resolve this I'm going to go borrow one. I havn't disassembled the mags yet as it seemed unlikely they were the cause, when the problem persisted across multiple mags that have seen varying amounts of use. I suppose they could've all recently rusted, though?
Also, have you (or anyone else) adjusted the mag catch on the rifle?
I didn't fiddle with the mag catch until I had this problem. Changing the spring and the amount the release button is screwed onto the catch doesn't seem to be affecting things. (And if my girlfriend broke it, she isn't fessing up.
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If the 30 round mag seats with the bolt open, will it cycle regularly?
I didn't try firing it (the sun had set by the time I got to trying that), but I could rack the charging handle repeatedly, and rounds were stripped off the magazine, chambered, extracted and ejected properly.
With the mags loaded 11 or more rounds and inserted into the mag well, will they gradually come to a halt (insert the mag slowly, it gets harder and harder to insert until it stops) or does it hit something and stops (goes in easily then hits something abruptly stopping)?
Insertion is smooth, the mag gets in about as far as I expect it to, but it doesn't seem to catch.
