Kimber America Magazine, Kim Pro, Tac Mag, 45 ACP, 7 Rounds, For Compact 1911, Stainless Steel, Silver 1100813A Designed for Compact and Ultra Kimber models" 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.