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This is the CMMG .22LR, 16" CM, M4, RGB Complete Upper Receiver Group. The CMMG M4LEP .22 Caliber AR-15 upper maintains compatibility with all the same parts and accessories that fit your full caliber AR's, including the lower receiver. Caliber: .22LR Sporting Chamber. Barrel: 16" M4 Profile Barrel, WASP Treated 4140 Chrome-Moly Vanadium Steel, 1:16" Twist. Hand Guard: M4 Hand Guard . Sights/Gas Block: Receiver Height Railed Gas Block. Bolt Group: Phosphated .22 Bolt Group. W.A.S.P. Treated Barrel (Weapon Armament Surface Protection) is a salt bath ferritic nitrocarburizing surface conversion process or more commonly referred to as nitriding. The nitriding conversion is applied to the barrel inside and out, along with the front sight base on our LE rifles and uppers. Nitriding offers improved wear, abrasion, and corrosion resistance when compared to hard chrome lining or phosphating. Unlike chrome lining, where the chrome is built up on the surface, nitriding converts the surface without the risk of dimensional build up. CMMG pioneered the use of this nitriding process on AR barrels and has been using it for many years. CMMG forged upper receiver. Each upper is head spaced and test fired. Magazine is not included.
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