Originally Posted by
mark5pt56
These are double stack, SINGLE FEED magazines. They two things I can think of in the feeding cycle causing this the bolt riding on the magazine (top of) But unlikely. The other is excessive magazine spring tension which I've never experienced in the 5-6 various platforms I've had with a AICS. Since the bolt over rides the magazine and pushes the round forward, those are the two things having friction. The stoning of the underside of the feed lips may minimize the excessive spring tension if there's rough edges.