Kimber America Magazine, Kim Pro, Tac Mag, 45 ACP, 8 Rounds, For 1911, Stainless Steel, Silver 1100721A Designed for full-size Kimber models (Custom" Pro" Ultra+)" this Tac-Mag features a Teflon-coated stainless steel follower" Rocket wire spring and an exclusive quick-change floorplate with three included bases: a conventional stainless steel plate" slim bumper pad and a thick bumper pad for competition or use with extended magazine wells.