AR-45 Upper Receiver Group (DI)



Our Macon Armory AR45 direct impingement upper receiver group barrel is 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.

This upper receiver group is compatible with dedicated AR45 lower receivers machined for M3 “grease-gun” magazines, including the CNC Gunsmithing AR45 lower receiver, Bazooka Brothers B-AR45 lower receiver and GWACS Armory Cav-15 MKII with Hahn precision adapter. Additionally, the DI45 upper has proven to be exceptionally reliable on the new Angstadt Arms large frame Glock lower receiver , as well as the CMMG Banshee large frame Glock mag lower. With a slight mag catch mod that the mfg is going to offer replacement mag catches….we are now endorsing the new Wolfpack Armory large frame glock lower currently available as an 80%. We do NOT recommend New Frontier large frame Glock lowers.

AR45 DI upper receiver group includes:

  • Barreled upper with bolt carrier group
  • Samson Evolution free float forearm
  • A2 flash suppressor
  • Samson Evolution series accessory rail package consisting of two 2-inch and one 4-inch rails

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″.

Additional information

Barrel length

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Macon Armory


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