The Check-Mate 1911 Double Stack Ultra-Hi Capacity 140mm magazine delivers 22rds of 9mm in the same flush-fit footprint as a standard 17-round magazine, maximizing capacity without added bulk. Engineered with an optimized feeding angle and patented spring and follower system, Check-Mate's magazine provides reliable feeding with FMJ and hollow points and increases slide lock-back power by 50%. +2 Round Capacity in Same Size as Classic Mags CNC 6065 Aluminum Basepad +20% Power Springs // 4x Spring Life Patented UHC Follower and Spring System Lifetime Warranty