 In the mid 1960s, Crouch sold his design to the High Standard Manufacturing Company, who used their C1200 Supermatic shotgun as the basis for the first model, the 10A.The C1200 Supermatic was modified by replacing the stock, relocating the trigger assembly, and fitting a three-piece plastic shell around the receiver and first half of the barrel.The rearward piece of the shell provided an attachment point for the rotatable shoulder stock.