Cart 0

AR-45 Upper Receiver Group (BB)

  • $579.99

Our Macon Armory AR45 blowback upper receiver group is based on the Colt pattern. Our barrels are black nitride coated and hand-crafted with a 1:16 twist and 5/8 x 24 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 the Macon Armory AR45 magazine and magazine well adapter, This receiver has been tested without malfunction on Quartercircle 10, New Frontier Armory,  Black Creek Precision and Angstadt Arms large frame Glock magazine lowers. 

Pictures do not accurately represent the current upper configuration. Blowback uppers are currently being built with JLBillet slick side uppers with a 3/4 ejection port door and blast deflector made to match the contours of the upper. Mlok handguards are installed and shipped with these uppers.


AR45 BB upper receiver group includes:

  • Barreled upper with bolt
  • Heavy Buffer
  • Mlok 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