A while back I picked up an AR7 and just got to shoot it last week. The rifle didn't come with mags, and had sat in the previous owner's closet for 10 years or so. I ordered a couple 10 round repro mags and have had a ton of feeding problems with it. It seems like the magazine isn't sitting high enough up in the well, but on disassembly and test fitting it is in the right place at the right time. I'm going to give the internals the cleaning of a lifetime, but I don't think this is going to help. I've only handled two of these so far, and the first one was back when I was 6 so I can't attest to any difference of form. Is it cheap mags? Do I have to polish a 'feed ramp' into the back of the barrel? Help!