Stick to a classic brand for your AR-10 with this Smith & Wesson M&P10 Optic-Ready Semi-Auto Rifle. The M&P10 comes with standard mil-spec-style AR-10 furniture and features Picatinny Arsenal's innovative rail design, which allows you to attach an optic to your AR10. The direct-impingement gas system keeps recoil comfortable. The barrel features a 1:10 twist with 5R rifling and a flash hider threaded onto the end of the muzzle. Finding the right eye relief is a breeze with the 6-position stock. Simply add an optic of your choice and this optics-ready AR-10 will be ready for you. Optics ready with the Picatinny-railed upper receiver Mil-spec-style furniture 1:10 twist, 5R rifling Flash hider 6-position adjustable stock