Rugers AR-556 MPR's aluminum flat top upper receiver includes a forward assist, dust cover and brass deflector. The rifle-length gas system provides smoother operation and reduces felt recoil, the Ruger muzzle brake is a radial port design that significantly reduces felt recoil and muzzle movement. The threaded barrel allows for standard muzzle accessories to be installed. Handguard is free-floated for accuracy and the slim 15" length provides enhanced ergonomics. Lower receiver is fitted with Magpul MOE grip and MOE SL collapsible buttstock on a Mil-Spec buffer tube. Includes a 30-round Magpul PMAG magazine.