Panzer Arms M4: This phenomenal M4 semi-automatic shotgun is quickly becoming legendary for rugged reliability you can count on in the most adverse circumstances and conditions. The M4 Tactical shotgun is light, durable, fast-handling, and an exact copy of the well respected brand name with the famous A.R.G.O Piston-driven semi-auto action. This action is one of the best ever developed and cycles everything from target loads to the heaviest 3-inch magnums. Also featured on this model is an extended mag tube with sling attachment points. A rail section runs along the top of the receiver and is perfect for optics mounting. If you do not wish to mount an optic, ghost ring sights come standard. This particular model is the M4 Marine Grade Tactical M4. It is enhanced with an Electroless Nickel-Phosphorus Plating finish for increased corrosion resistance and durability. The barrel, receiver, magazine tube and many internal parts are also coated, with the bolt being black over chrome plated giving it added toughness and also proving a beautiful accent to the black stock. The robust tactical design and legendary reliability of the action make this a must-have shotgun.