Griffin Armament MK1 CQB .223 Wylde Suppressed Complete Upper - 11.5"

Griffin HEDP(TM) Barrels provide High Endurance Dual Purpose functionality- offering high durability and precision accuracy. Nitrided 416R stainless steel provides the highest possible hardness and longest throat life available with match grade bore dimensions and bore finish. HEDP(TM) barrel bores are hand lapped, ensuring batch to batch consistency and accuracy. TRUE-BORE(TM) concentric suppressor grade threads provide an optimized thread interface for your silencer regardless of brand or model. M4 feed ramps and chambers are polished prior to nitriding for smooth reliable feeding, chambering, and extraction. Gas ports were carefully engineered to provide reliable function suppressed or unsuppressed with 5.56 NATO ammunition. M4A1 contour diameter between the chamber and gas block for minimal POI shift with suppressors and maximum accuracy and durability while maintaining field weight.Features: 416R SS barrel manufactured from stress relieved certified barrel steel Black nitrided for extended service life Magnetic particle inspected Button rifled 223 Wylde chamber for optimal accuracy Carbine length gas for softer recoil characteristics .750" gas block journal M4A1 diameter for reduced POI shift / Increased Accuracy & Durability Air gauged and hand lapped bore Polished chamber and M4 feed ramps TRU-BORE(TM) suppressor quality threads Suppressor optimized gas ports .625" , 1/2x28 industry standard threads