Armscor Pistol Magazine, 22 TCM/9MM, 10 Rounds, Fits TCM A1 Pistols, Steel, Matte Finish 38.747 This Rock Island Armory 1911 Full Size Magazine is a standard factory replacement magazine. This magazine is for single stack 1911 models chambered in 22TCM and holds 10 rounds of ammunition. It is made of stainless steel and is made to Armscor/Rock Island Armory specifications and tolerances" using the same manufacturing and materials as the original equipment magazines" ensuring perfect fit and operation.