Sa-B13 Keymod 10” Carbine Replica Specna ArmsSA B13 KeyMod 10 Carbine Replica SA B13 by Specna Arms was mostly made from an alloy of zinc and aluminum with several steel elements placed in the most troublesome spots of the replica (pins, screws and tactical sling swivels). The SF type stock, which stores a battery, as well as the pistol grip were made from polymer. The body of the replica has undergone a process of anodizing, which guarantees a high level of protection against corrosion. The