I know that USA magazines are considered junk by most who frequent this forum, but I bought a handful of USA 10 rounders before I found the forum. Sure enough almost every one of them has the same problem - the last round comes out the the magazine and just sits there losely on top of it. Thus the follower comes up and locks the bolt open. Other than that, they all feed well. In comparing the USA's to the factory Ruger mag, two things are clear. One is the USA follower is not the same - the right side groove is not as deep and the left side does not have a cut out for the feed lip. The second is that the feed lips seem too open. I will experiment with bending the feed lips down a little more and see if that helps. Also, I was thinking of ordering ruger followers and installing them. I found them at Brownells for $2.85 each. But, I can't figure out how to disassemble the darned USA mags. I read the Ruger disassembly instructions, and they don't seem to apply.
Two questions: (1) can someone tell me how to disassemble a USA mag, (2) do you think the follower swap out will work?
Two questions: (1) can someone tell me how to disassemble a USA mag, (2) do you think the follower swap out will work?