GC_UPC Panzer Arms M4 12 Gauge Semi-Automatic Shotgun 18.5" Barrel Nickel and Black Pistol Grip $499.99 - show more like this 0.00 MidwayUSA GC_UPC Panzer Arms M4 Marine Grade Tactical Semi-Auto Shotgun 18.5" Barrel 12GA 3" 5 Round, Piston Driven, Electroless Nickel-Phosphorus Finish - PAM4MTSSS $519.99 PAM4MTSSS show more like this Calculated in Cart Classic Firearms GC_UPC Panzer Arms M4 Marine Tactical Nickel 12 GA 18.5" Barrel 5-Rounds Fixed Stock $533.99 PAM4MTSSS show more like this 9.99 GrabAGun.com