Iver Johnson Arms STRYKER Stryker 12 Gauge 5 Round Metal Black Finish This Box Magazine Is Compatible With Your Iver Stryker 12 Gauge Shotgun. It Is constructed Of Metal With a Synthetic Follower. Caliber: 12 Gauge Capacity: 5 Rd Finish: Black Model: Stryker Material: Metal Type: Box Magazine Model Fit: Stryker Brand Fit: Iver