The Rock Island Armory 1911 Full Size Magazine is a standard factory replacement magazine. This magazine is for single stack A-1 1911 models chambered in 22TCM and holds 10 rounds of ammunition. It is made of 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. For RIA TCM Rock Std Pistol. 22TCM 10 Rounds Steel magazine body Polymer base plate Stainless Finish Fits : Rock Island Armory Full Size 1911 chambered in 22TCM single stack only