This Rock Island Armory 1911 Full size Magazine is a standard factory replacement magazine. This magazine is for single stack 1911 models chambered in .40S&W and holds 8 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.Features :Steel Magazine BodyRubber Base PlatePerfect Fit and Operation