Armscor Magazine. 380ACP, 7 Rounds, Fits Armscor Baby Rock, Stainless Steel 380.797 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.