Rock Island Baby Rock Stainless Steel 1911 380 Auto (ACP) Handgun Magazine - 7 Rounds - The Rock Island Armory Baby Rock Magazine is a standard factory replacement magazine. This magazine is for the Baby Rock model chambered in 380ACP and holds 7 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.