10.5" 338 ARC Upper - Chrome Moly HBAR Barrel - 10" MLOK Rail

10.5" 338 ARC Upper for AR-15 with Chrome Moly HBAR Barrel and 10" M-LOK Rail

The 338 ARC was engineered to deliver outstanding energy and suppressed performance from the AR-15 platform while maintaining excellent reliability with both subsonic and supersonic ammunition. Designed around modern heavy-caliber projectiles, the 338 ARC offers exceptional terminal performance for hunting, tactical applications, and suppressed shooting. This 10.5" 338 ARC upper features a durable chrome moly HBAR barrel, pistol-length gas system, A2 flash hider, and lightweight 10" free-float M-LOK handguard, making it an outstanding choice for anyone building a compact 338 ARC AR-15 upper or upgrading an existing rifle.

Quick Glance:

Caliber: 338 ARC
Platform: AR-15
Barrel Length: 10.5 inches
Barrel Material: 4150 Chrome Moly Steel
Barrel Profile: HBAR
Barrel Finish: Parkerized
Twist Rate: 1:8 Twist
Gas System: Pistol Length
Handguard Length: 10 inches
Handguard Type: Lightweight Free-Float M-LOK
Upper Receiver: Forged 7075-T6 Mil-Spec AR-15 Upper
Gas Block: .750" Low Profile
Muzzle Threads: 5/8x24
Muzzle Device: A2 Flash Hider
Headspace Checked: Yes – Manson GO and NO-GO Gauges
Assembly: Fully Assembled Upper Receiver Assembly

Full Details:

Upper Receiver:
AR-15 Mil-Spec forged aluminum upper receiver with forward assist and dust cover assembly installed. Forged from durable 7075-T6 aluminum and protected with a matte black MIL-A-8625 Type III, Class 2 hard coat anodized finish. The 7075-T6 construction provides greater strength than commonly used 6061 billet aluminum.

Barrel:
10.5" 338 ARC barrel manufactured from durable 4150 chrome moly steel with an HBAR profile, Parkerized finish, and 1:8 twist rate. Features 5/8x24 muzzle threads, a standard AR-15 barrel extension with 30 Cal. feed ramps, and is professionally headspaced using Manson GO and NO-GO gauges. The pistol-length gas system provides reliable cycling with both subsonic and supersonic 338 ARC ammunition, making this AR-15 upper an excellent option for suppressed shooting, hunting, and defensive applications.

Handguard:
Premium lightweight 10" Mid Length narrow-profile AR-15 free-float M-LOK handguard. M-LOK slots along the 3, 6, and 9 o'clock positions provide ample room for mounting optics, lights, lasers, grips, bipods, sling attachments, and other M-LOK compatible accessories. Machined from 6061 aircraft-grade aluminum and protected with a matte black MIL-A-8625 Type III, Class 2 hard coat anodized finish.

Gas System:
Pistol-length gas system paired with a .750" low-profile gas block. The pistol-length gas system is optimized to provide dependable cycling across a wide range of 338 ARC ammunition while maintaining smooth operation in both suppressed and unsuppressed configurations.

Muzzle Device:
A2 flash hider installed to reduce visible muzzle flash while protecting the barrel's 5/8x24 muzzle threads.

Magazine Recommendation:
For best performance, Ballistic Barn recommends using 400 Legend magazines with all 338 ARC uppers to maximize feeding reliability.

Headspace Checked:
Every barrel is professionally headspaced using Manson GO and NO-GO gauges to help verify proper chamber dimensions and dependable operation.

Ready to Install:
This upper arrives fully assembled and is compatible with all standard Mil-Spec dimension AR-15 lower receivers.

Important:
This product is not a firearm and will be shipped directly to you. No FFL transfer is required.

Ballistic Barn AR-15 uppers are American made and machined by manufacturers specializing in Mil-Spec AR-15 components. Every barrel is professionally headspaced using Manson GO and NO-GO gauges to help ensure dependable function and outstanding accuracy.