Caliber: 45 Colt/410 Bore, 300 Blackout, 5.56. Capacity: 1 Round. Rear Sight: Serrated. Gauge: .410 ga (2.5” and 3”-45 Colt/.410 Model). Front Sight: Fixed. Action Type: SAO. Barrel Length: 9.00”. Overall Length: 14.00”. Overall Weight: 36.80 oz. (unloaded). Grooves: 6. Overall Height: 5.90”. Overall Width: 1.30”. Twist Rate: 1:24" RH. Frame Material: Polymer. Barrel Finish: Matte black. Frame Finish: Black. Barrel Material: Alloy steel. Safety: Thumb safety, transfer bar.