FLUKE?/ actual milage may vary
guess i'm the minority here....i have had group purchase chipmac's from a local dealer (i have included this info in the assumption they were made in at least nearly the same time frame), where some worked fine, and others from the same lot didn't. same-o for colt's, wilson's, kimber's, springfield etc. have had some that work well in one colt, or kimber, but NOT another colt/kimber????
-that to include 7,8 and ten round flavors.-
one of my long term projects is to try each mag in each platform, then sell those which have ANY failures, in ANY iron. judging by last gun show, even used they will fetch new prices for those willing to shop around for better deals online or in catalogs.
gunnie