Noveske Gen 4, Semi-Auto, AR, 223REM/556NATO, 17 Barrel, Noveske 2 Port Brake, NSR-15 M-LOK Handguard, Armor Black Cerakote Finish, CMC 3.5LB Trigger, B5 Stock and Grip, 40 Rounds 02000567 This rifle features a Gen 4 precision machined billet upper receiver with extended feed ramp and anti-rotation interface with the handguard. Additional features include a 17" Rival barrel with 1/7 twist, CMC 3.5 lb trigger, 15" NSR M-LOK rail, Magpul MBUS Pro Degree Offset sights and a B5 buttstock assembly.