The MR-1 features a stainless steel, a self-cleaning piston that operates directly against the proven rotating bolt, thereby eliminating the need for complex linkages found on other, inferior gas systems. This piston-driven system, perfected by Benelli, incorporates a gas port located just forward of the chamber, where the gases are hotter and cleaner, resulting in less fouling and more reliable cycling. The result is a tough reliability and the ability to function in the harshest environmental conditions. The action is a gas-operated, rotating bolt, using the ARGO system patented by Benelli. The rifle is the little brother of the Benelli Argo full-size hunting rifle. This weapon operates only in semi-automatic mode, and no selective-fire or otherwise full-automatic version of the MR1 carbine is planned. Built on the military-tested Auto Regulating Gas Operated (A.R.G.O.), the Benelli MR-1 has a proven history of reliable performance. Picatinny rail atop the receiver accepts sights, lights or other accessories. Also features a mil-spec rear aperture sight and protected front blade. Chrome-lined barrel has a 1-in-9 twist. M4-style tactical stock with pistol grip and intuitive cross-bolt safety, bolt lock and magazine release for comfortable, easy operation. Includes five-round magazine. Additional Information: -Comfortable, easy operation -Picatinny rail easily accepts accessories -Chrome-lined barrel -20" Barrel. -Ghost-ring sights. -Collapsable Stock.