9mm Upper Receiver Group (BB)
Our Macon Armory AR9 blowback upper receiver group is based on the Colt pattern. Our barrels are black nitride coated and hand-crafted with a 1:10 twist and 1/2 x 28 muzzle thread using 4140 Chrome Molybdenum steel, providing both accuracy, durability and versatility. Uppers are built around an Aero Precision non forward assist upper receiver and include blast deflector and 3/4 ejection port cover.
This blowback upper receiver group is compatible with all currently available (mm platforms based on the Colt pattern or Glock magazine dedicated lowers.
AR45 BB upper receiver group includes:
- Barreled upper with bolt
- Heavy Buffer
- KeyMod free float forearm
- A2 flash suppressor
It is the customer's responsibility to be aware of all applicable laws and regulations regarding purchase and ownership of upper receivers with a barrel length of less than 16".</em