GG&G, Inc. Beretta 1301 Stock Adapter, Fits Magpul SGA stock for Remington, Black GGG-2717 Many 1301 shooters prefer the Magpul SGA Mossberg or SGA Remington 870 stock to the factory Beretta stock. The GG&G replacement stock adapter for the Beretta 1301 allows an easy transition to either one of these Magpul SGA stocks.