Description
AR-15 LineMoriarti AR-15 .338 ARC 12.5" Upper Assembly | M-LOK | Thread ProtectorThe Moriarti AR-15 .338 ARC 12.5" Upper Assembly delivers the perfect balance of compact maneuverability and ballistic capability for suppressed or short-range applications. Built on a rugged A3 flat-top receiver, this upper assembly is chambered in the hard-hitting .338 Advanced Rifle Cartridge, optimized for superior accuracy, versatility, and modularity. Key Features: Barrel Length: 12.5" Chamber: .338 ARC Twist Rate: 1:5 (ideal for stabilizing heavy 200–225 grain bullets) Material: 4150 Chrome Moly Vanadium Finish: Nitride Thread: 5/8x24 Muzzle Device: Thread Protector – ideal for custom muzzle devices or suppressed builds Profile: Government Gas System Pistol-length for optimal cycling Steel low-profile gas block Upper Receiver A3 flat-top, forged 7075-T6 aluminum Mil-spec hardcoat anodized Includes forward assist and dust cover Excellent platform for red dots, LPVOs, and night vision Handguard 10" Super Slim Free Float M-LOK Lightweight aircraft-grade aluminum M-LOK attachment slots at 3, 6, and 9 o’clock Ergonomic, ventilated design for heat dissipation and control Ballistic Performance Estimate (Supersonic Loads) Barrel Length Velocity (200–225gr) Use Case10.5"~1,500–1,600 fpsSubsonic / Suppressed Only12.5"~1,700–1,800 fpsSubsonic-Capable + Short-Range14.5"~1,900–2,000 fpsGeneral Use / Carbine Builds16"~2,000–2,100 fpsBest Energy for Hunting18"~2,150–2,250 fpsMax Range, Heavy Bullet Loads Suggested Pairings Customize further with Moriarti Builder Sets in Cerakote Note: Bolt Carrier Group and Charging Handle not included but can be added as options. Proudly made in the USA by Moriarti Armaments. The product images are for illustrative purposes, and the actual product may vary slightly in rail design or appearance, based on stock availability.
