Also referred to as Nitriding, this treatment produces an extremely hard, slick surface on steel that resists carbon adhesion and increases corrosion resistance, making for easier cleaning and maintenance. Upper must be installed on a lower receiver compatible with, or modified to accept, Colt-Style 9mm Luger box magazines.ĬMMG’s durable Weapons Armament Surface Protection (WASP) Melonite treatment is a unique protective coating applied to the barrel that surface-hardens the metal, extending barrel service life by reducing friction in the bore and lessening bore surface wear. The upper makes use of a ramped, 9mm specific bolt that enables the use of a standard AR-15 hammer (dedicated 9mm hammers are not compatible), and comes complete with a shortened ejection port/ejection port cover and large polymer brass deflector. This complete CMMG AR-15 M4 LE Upper Assembly features a chrome-moly steel barrel with a WASP Melonite treated bore and exterior. The FLASH HIDER will be replaced with a YANKEE HILL MACHINE YHM-9853-36-A PHANTOM FLASH HIDER for a WRAITH XL QD SOUND SUPPRESSOR with a 1/2″-36 thread. I will be throwing out the A2 handguard in favor of a MAGPUL FOLIAGE GREEN MOE CARBINE HANDGUARD. Note: If I had an abundance of 9mm Glock magazines on hand I would consider a Glock build. The fourth an final reason is that BROWNELLS has the unit in stock. The third reason is the CMMG 9mm AR15 UPPER RECIEVER ASSEMBLY utilizes a bolt carrier group modified to accept any AR15 trigger group as opposed to the competition that relies on a dedicated 9mm hammer to function correctly. The first two reasons being I could use it with my HAHN PRECISION 9mm RECEIVER BLOCK with COLT 9mm 32 ROUND MAGAZINES. In the end I selected the CMMG 9mm AR15 UPPER RECIEVER ASSEMBLY for four reasons. I have been on the fence for a while trying to decide what 9mm ar15 UPPER RECIEVER ASSEMBLY to purchase.
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