Experience the superior performance of the Moriarti AR-15 .338 ARC 10.5" Upper Assembly, built for precision, modularity, and reliability in compact AR-15 pistol platforms. Whether you're looking for a tactical upgrade or a hunting companion, this upper is engineered to deliver next-level ballistic performance in a compact design.
Barrel
Length: 10.5"
Chamber: .338 ARC
Twist Rate: 1:5 (optimized for heavy grain bullets)
Material: 4150 Chrome Moly Vanadium
Finish: Nitride
Thread Pitch: 5/8x24
Profile: Government
Muzzle Device: A2 Flash Hider – reduces flash and recoil for improved control and low-light shooting
Gas System
Pistol-length gas system for reliable cycling
Steel low-profile gas block
Upper Receiver
A3 flat-top design
7075-T6 aluminum forged construction
Black hardcoat anodized (mil-spec)
Includes forward assist and dust cover
Ideal platform for optics and accessories
Handguard
10" Super Slim Free Float M-LOK Rail
Lightweight and ergonomic
M-LOK slots for modular accessory attachment
Free-float design enhances accuracy
Match it with our Moriarti AR-15 6.5 Grendel BCG
Complete your build with Moriarti Custom Cerakote Builder Sets
Note: Bolt Carrier Group (BCG) and Charging Handle are not included but can be added separately.
Made in the USA by Moriarti Armaments – Precision meets innovation.
Images may not be an exact representation of the product.
Tags: moriarti, ar-15, .338, arc, 10.5 10.5 10.5 10.5", upper, assembly, m-lok, flash, hider