Radical Defense MK1 Mod 1, CQC, Semi-automatic, SBR, 556NATO, 12.5, Black, B5, 30 Rounds, 1 Mag, 1:7, MLOK, Iron Sights, Anodized, B5 Bravo MK1MOD1CQC The RD MK1 MOD1 CQC is a 12.5" SBR available in 5.56 NATO. Equipped standard with RD Suppressor KFM Taper Lock Flash Hider, Battle Arms Development RACK Ambidextrous Charging Handle, B5 Systems Bravo Stock, B5 Grip, Nickel Teflon Single Stage trigger, ambidextrous selector, enhanced trigger guard and optional Griffin Armament M2 Iron Sights. All of Radical's MK1 MOD1 series carbines utilize their patented threaded straight gas tube and gas block to eliminate gas leakage and help reduce recoil. MK1 M-LOK handguards are thermal fit to a steel barrel nut with a robust Tombstone lock up resulting in an extremely rigid handguard.