Description 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.Compatibility:Kimber Custom, ProUltra+ and other models with full-length gripColt Government and Commander modelsPlus almost any brand and model of mil-spec 1911.