Moriarti AR-45 .45 ACP 16" Slick Side M-LOK Upper with BCG & CH, Non-LRBHO

AR-45 16" Upper: Specs

Build your AR-45 the right way with this Moriarti Armaments premium upper receiver assembly – chambered in .45 ACP and built on a slick side billet upper for clean aesthetics and smooth cycling. Designed without LRBHO (Last Round Bolt Hold Open) for increased compatibility and California compliance, this complete package is perfect for your blowback AR-45 build.

Key Features:

• Barrel: 16” match-grade barrel chambered in .45 ACP

  • 4150 CrMoV steel, black nitride finish

  • Twist rate: 1:16 RH

  • Threaded 5/8x24 with integrated feed ramp

  • Topped with CLAW multiprong muzzle brake

• Upper Receiver:

  • “Slick Side” billet upper made from 7075-T6 aluminum

  • Mil-Spec Type III hardcoat anodized

  • No dust cover or forward assist

  • Compatible with AR-15/AR-9/AR-45 standard components

• Gas System:

  • Blowback operation for enhanced reliability with .45 ACP

• Handguard:

  • 15" slim M-LOK free-float rail

  • Lightweight aircraft-grade aluminum

  • Hardcoat anodized for durability and accessory compatibility

• Bolt Carrier Group:

  • Precision-milled, M-16 cut, ramped BCG

  • 8620 steel, phosphate finish

  • Works with Glock-style or traditional AR-45 lowers

• Charging Handle:

  • Standard AR-style charging handle included

Note: This upper does not include LRBHO functionality. Compatible with Glock magazine AR-45 lowers and standard .45 ACP blowback systems. CA compliant design. Images may not be the exact representation of the product as rail variations in mlok design may occur due to stock availability.

FAQ

What lower does it fit?

A dedicated pistol-caliber AR lower that takes Glock-style .45 ACP magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback pistol-caliber design with no gas tube or gas block, so a heavy PCC buffer is used for reliable cycling.

Does the bolt lock back on empty?

No. This is a non-LRBHO setup, so the bolt does not hold open after the last round.

Is a lower receiver included?

No. This is an upper assembly only; the lower receiver and magazine are sold separately.

Related: AR-45 upper assemblies · pistol caliber carbines