![]() ![]() 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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