Great Lakes Firearms AR-15 Mission .223 Wylde 30+1 16", Urban Camo Rec/15" M-Lok Handguard, Black Carbine Stock & A2 Grip, Muzzle Brake. Chambered in .223 Wylde, which was designed to maximize the ballistics of both .223Rem and 5.56Nato, these GLFA AR15 rifles feature a 16" barrel in your choice of a beautiful 416r stainless steel or an ultra-smooth 4150 CRMOV black nitride finish with a 1:8" twist. These rifles use M4 feed ramps. The heavy barrel incorporates a carbine-length gas tube, with 0.750 Gas Block. The barrel is threaded in 1/2x28 and is fitted with a ported compensator hand tightened to the firearm. Each barrel is surrounded by a 15.25" 6061 aluminum M-Lok handguard with a full picatinny rail on top, allowing you to attach the different accessories you may require.