actually I have tried almost every single trype of 1911 magazine out there. chip McCormic shooting star, power 8 mags, power 10 mags, match grade, wilson combat, mec gar, USA mags, colt factory mags, metalform, USGI mags, pachmayer, and lots of no name brands.
these mags are ACT mags with the dlask name on them but they are the most reliable magazines I ever tried. the follower doesn't move forward like Chip McCormic mags. the springs are strong and don't bind up when fully loaded, and the steel is a heavier gauge than other magazines. similar to the thickness of power mags. the follower has little side to side play so it doesn't have a chance to jump over the slide stop and jam up your gun like the split followers do
my only wish is that someone would make a magazine with this kind of reliablility and quality that is flush with the bottom of the mag well. kind of like trying to find non extended safeties and arched mainspring housings. impossible