Moriarti AR-45 16" Side Charging LRBHO Upper w/ BCG – .45 ACP

Uppers

Moriarti AR-45 16" Side Charging LRBHO Upper Assembly w/ BCG – .45 ACP

The Moriarti AR-45 16" Side Charging Complete Upper Assembly delivers precision, power, and innovative design in a .45 ACP blowback platform. This upper is built on a non-reciprocating side-charging billet upper receiver with integrated Last Round Bolt Hold Open (LRBHO) for improved functionality and performance.

Whether you're building a pistol-caliber carbine or looking for a reliable .45 ACP AR upgrade, this complete upper—fully assembled and test-fired—is engineered for smooth cycling, modularity, and compatibility with Glock mag AR-style lower receivers.

Key Features:

• Barrel: 16" Match-Grade .45 ACP, 4150 CrMoV steel, black nitride finish, 1:16 twist, threaded 5/8x24 with A2 flash hider

• Upper Receiver: Side-charging, non-reciprocating, billet 6061 aluminum, Mil-Spec anodized, includes LRBHO

• Handguard: Rifle-length (approx. 15") M-LOK free-float, aircraft-grade aluminum, hardcoat anodized

• Gas System: Blowback operation (no gas block required)

• Bolt Carrier Group (BCG):

  • US-made 8620 steel

  • Phosphate finish

  • M16 cut

  • Glock & Colt compatible

• Charging Handle: Side charging, non-reciprocating

• Weight: 4.2 lbs

• Compatibility: Works with Moriarti AR-45 billet lowers and most Glock-mag lowers

• Current Lead Time: Approx. 14–30 days (Made to order)

Note: For optimal performance, Moriarti recommends using a heavy buffer when building your AR-45 with this upper.

• Pair with the Moriarti AR-45 Billet Lower Receiver