Mag pickiness common with AR's?
Am I the only one that seems to have a 50/50 track with finding mags that work? My current AR (SA&A AR in 5.56) came with 2 mags, both of the steel mil-surp variety, one locks and works beautifully, the other locks but invariably becomes unseated and falls out after firing just a round or two (it's not a matter of the mag being overloaded, it will even happen if the mag is loaded with even as few as 5 rounds, the mag does not appear to be damaged). I've since bought 2 more mags, a pmag and another steel mil-surp, the pmag will not lock (again, it's not overloaded, it won't lock in even when empty), but the mil-surp locks properly and works well.
Is this common and just part of the game? Or is something wrong with my rifle that needs to be fixed?
"My momma, she done told me, there's heart and then there's hate
If one of 'em's inside of you, the other one, it aint."