I purchased 3 Tripp mags for my Delta Elite. The caliber stamping into the magazine body on three of the mags bent the body in far enough that they can't be loaded to capacity. The third can be loaded to capacity, but only with great difficulty. And the extreme upward force of the spring noticeably slows down slide velocity.Otherwise, heard good things about Tripp mags (especially their follower) and McCormick's.