My girlfriends rifle (Colt 6920) ran into some issues today. We're talking about a barely used rifle that has worked flawlessly until now, but on the last (ie. second - now this is some high speed low drag training! ) magazine of the day the gun suddenly had multiple failures to feed (bolt over base). This was with a brand new, never before used Brownells aluminium magazine. Ammunition was the same Lithuanian 55gr FMJ (made by GGG) that has worked well in both our guns before. Since the gun has been running fine until now, I'm thinking this must be the magazines fault.
I've understood that this sort of thing ought to be fairly rare with "B-mags". But how rare of an occurrence are we talking about here? So far I've got ten of the bloody things stashed away (in addition to my training magazines, that is), and I'm hoping to buy many, many more while I still can - firing thirty rounds through each and every magazine in order to test fire them would be way too expensive to be economically feasible. How likely will I end up stashing junk magazines with my plan?