AR-10MM 4" Slick Side Upper – Compact LRBHO | Moriarti Arms

Uppers

AR-10MM 4" Slick Side Upper – Compact LRBHO | Moriarti Arms

Designed for compact AR pistol builds, the AR-10MM 4" Slick Side Complete Upper by Moriarti Arms offers clean aesthetics and top-tier performance. Built on a slick-side billet upper with Last Round Bolt Hold Open (LRBHO), this 10mm upper includes a ramped BCG, charging handle, and a 4" free-float M-LOK handguard, giving you everything you need to pin to your Glock-mag AR lower.

Whether you're building a discreet backpack gun or a personal defense weapon, this upper is a lightweight, American-made solution with premium parts and attention to detail.

Key Features:

• Barrel: 4" 10MM match grade, 4150 CrMo steel, black nitride, 1:16 twist, 5/8x24 threaded, A2 flash hider

• Upper Receiver: Slick side 6061 billet aluminum, hardcoat anodized, LRBHO integrated, no forward assist or dust cover

• Handguard: 4" slim M-LOK free-float rail, aircraft-grade aluminum, black hardcoat anodized

• Gas System: Blowback

• Bolt Carrier Group (BCG): Ramped, Glock & Colt compatible, 8620 steel, mag phosphate finish

• Charging Handle: Mil-spec

• Compatibility: Works with Glock-mag AR-9/40/45 lowers

• Weight: Approx. 3.2 lbs

• ETA: Ships in 8-10 weeks

• Country of Origin: USA