Moriarti AR-10MM 4" Side Charging Complete Upper – LRBHO, BCG, Ready to Pin

Uppers

AR-10MM 4″ Side Charging Complete Upper Receiver / LRBHO – Moriarti Arms

Engineered for tight quarters and powerful punch, the AR-10MM 4" Side Charging Complete Upper from Moriarti Arms is a top-tier option for compact AR pistol builds in 10mm Auto. Built on a non-reciprocating side charging billet upper receiver, this upper includes Last Round Bolt Hold Open (LRBHO) functionality and comes fully assembled with a ramped BCG and 4" M-LOK handguard.

Whether you're building a compact PDW-style firearm or a backpack gun, this upper is a high-quality, American-made solution compatible with most 45-acp glock style lowers.

Key Features:

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

• Upper Receiver: Billet 6061 aluminum, side charging, matte black anodized, LRBHO-ready

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

• Gas System: Blowback

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

• Charging System: Side charging with adjustable tension slide lock

• Compatibility: Compatible with most AR-15 Glock-mag lowers in 10mm/.40 S&W

• Weight: Approx. 3.2 lbs

• ETA: Ships in 8-10 weeks

• Country of Origin: USA