Gun owners can never have enough spare magazines on-hand for any gun, and PW Arms is ensuring that owners of its 12-gauge shotguns have an easy way to get their hands on spare mags through Brownells, thanks to this offering. Each PW Arms Panzer Magazine is designed to fit any of the company's shotguns, including the AR Twelve, Twelve PRO and BP-12 Bullpup. These magazines are designed for 12-gauge models only and each holds 10 shells.