The Panzer Arms M4 Tactical Shotgun with a Fixed stock and Skeleton body is a clone of the legendary M4 shotgun. It is a reliable, durable inertia-driven semi-automatic 12 gauge shotgun. It's made from 4140 steel with just a polymer coating to match the forward hand guard, and it comes in both standard butt stock and skeleton versions. Featuring instantly familiar handling, comfortable and ergonomic furniture, an extended tube magazine, and the famous M4 gas system.