After looking at the eleventy-billion previous threads about "what magazines work", it appears there is no simple answer aside from "just buy a factory mag." My "what makes a faulty magazine" thread led to the idea of this little endeavor. The idea is more of a data-gathering than...

Anyone else have problems with 30rd mags bending or flattening the top round at the case shoulder when the mag is inserted with a closed bolt? Even mangles the bullet and bends it off-axis to the point where it won't chamber? Max load at the time was with only 25 rounds of Winchester Q3131...

I received new factory 30 round today from midwayusa. I noticed right off that the mag had a gap on the back side in the edge where the steel is folded around the mag and spot welded. My other factory 30 rnd has no gap at all. The new mag is very hard to load the follower hangs up when trying...