I bought this 3-round one to use big game hunting where 3 is the max capacity you can have. I realize that this kind of weapon is not exactly designed for hunting but it works for me. Regardless, since this looks like a 5 round mag that has been re-worked to just accept 3 rounds I loaded pretty hard. Hoping it will loosen up as I use it as most mags do. Does what I need it to do and holds the bolt open on last round so it works, just an expensive 3-round magazine seeing as a bought a standard 20-round one at the same time for 3 bucks less.