Moriarti AR-45 .45 ACP 4" Side Charging Upper with LRBHO and BCG

Uppers

Moriarti AR-45 .45 ACP 4" Side Charging Upper / LRBHO / BCG Included

The Moriarti AR-45 .45 ACP 4" Side Charging Complete Upper Assembly is a compact powerhouse designed for your AR-45 pistol build. Built on a non-reciprocating billet side charging upper with integrated Last Round Bolt Hold Open (LRBHO) functionality, this upper delivers reliability, control, and compact performance.

Whether for CQB, personal defense, or tactical training, this upper assembly is fully assembled, test-fired, and includes a precision-milled AR-45 BCG. Compatible with Glock magazine AR-45 lowers, it’s ready to install and shoot right out of the box.

Please note: Uppers are on a monthly manufacturing schedule. Lead time is approximately 4 weeks.

Key Features:

Barrel:

• 4" Match-grade .45 ACP barrel

• 4150 CrMoV steel, black nitride finish

• Twist Rate: 1:16

• Muzzle Thread: 5/8x24 or .578x28 (varies by batch*)

• A2 Flash Hider installed

Side Charging Upper Receiver:

• 6061 Billet Aluminum

• Non-reciprocating side charger

• LRBHO (Last Round Bolt Hold Open) compatible

• Adjustable tension slide lock on handle

• Rear dust cover trap door

• Matte black hard-coat anodized (Mil-Spec Type III, Class 2)

• Compatible with Glock mag AR-9/40/45 lowers

Gas System:

• Blowback (no gas block or tube required)

Handguard:

• 4" Free-floating slim M-LOK rail

• Aircraft-grade aluminum

• Black hardcoat anodized

Bolt Carrier Group (Included):

• Ramped AR-45 BCG

• 8620 steel with mag phosphate finish

• M16 cut, full-auto compatible (where legal)

• Glock and Colt mag lower compatible

Charging Handle:

• Side charging handle included

Weight:

4.2 lbs assembled

Additional Notes:

• Thread may fluctuate between 5/8x24 and .578x28. Please contact us if a specific thread is required.

• For maximum performance, pair with a 8-10oz buffer system.

• Designed to match Moriarti Glock style billet lowers for full LRBHO functionality.

• Pair with the Moriarti AR-45 Billet Lower Receiver