20" 308 Upper - Chrome Moly HBAR Barrel - 15" MLOK Rail

20" .308 Winchester Upper with 4150 Chrome Moly HBAR Barrel, 1:10 Twist and 15" M-LOK Rail

This 20" .308 Winchester upper features a 4150 chrome moly steel HBAR barrel with a parkerized finish and 1:10 twist rate. Built around a DPMS Gen 1-pattern AR-10 upper receiver, the assembly combines a rifle-length gas system, 15" free-float M-LOK handguard, and A2 flash hider. The .308 Winchester cartridge is widely used for hunting, target shooting, and precision rifle applications, with a broad selection of available ammunition. Each upper is assembled in Texas and individually checked for proper headspace using Manson GO and NO-GO gauges.

Quick Glance:

Caliber: .308 Winchester
Platform: AR-10 - DPMS Gen 1 Pattern
Barrel Length: 20 inches
Barrel Material: 4150 Chrome Moly Steel
Barrel Profile: HBAR
Barrel Finish: Parkerized
Twist Rate: 1:10 Twist
Barrel Extension: DPMS Pattern with .308 Feed Ramps
Gas System: Rifle Length
Handguard Length: 15 inches
Handguard Type: Gen 3 Free-Float M-LOK
Upper Receiver: DPMS Gen 1 7075-T6 Billet Aluminum
Gas Block: .750" Low Profile Nitride
Muzzle Threads: 5/8x24
Muzzle Device: A2 Flash Hider with Crush Washer
Headspace Checked: Yes - Manson GO and NO-GO Gauges
Assembly: Fully Assembled in Texas

Full Details:

Upper Receiver:
DPMS Gen 1-pattern AR-10 upper receiver machined from 7075-T6 billet aluminum with forward assist and dust cover assembly installed. Features a matte black MIL-A-8625 Type III, Class 2 hard coat anodized finish. The 7075-T6 aluminum construction provides greater strength than commonly used 6061 billet aluminum.

Barrel:
20" .308 Winchester barrel manufactured from 4150 chrome moly steel with an HBAR profile, parkerized finish, and 1:10 twist rate. Features 5/8x24 muzzle threads and a DPMS-pattern barrel extension with .308 feed ramps. Each barrel is individually checked for proper headspace using Manson GO and NO-GO gauges.

Handguard:
Gen 3 15" extended rifle-length narrow-profile AR-10 free-float M-LOK handguard manufactured from 6061 aircraft-grade aluminum. M-LOK attachment slots are positioned along the 3, 6, and 9 o'clock positions, providing mounting space for compatible accessories. Features a matte black MIL-A-8625 Type III, Class 2 hard coat anodized finish.

Gas System:
Rifle-length gas system paired with a .750" low-profile gas block featuring a nitride finish.

Muzzle Device:
A2 flash hider installed with a crush washer on 5/8x24 muzzle threads.

Compatibility:
Designed for DPMS Gen 1-pattern AR-10 platforms, including compatible configurations from DPMS, PSA, Bushmaster, CMMG, and New Frontier Armory. Not compatible with the listed Armalite, Rock River Arms, or Anderson Manufacturing configurations. AR-10 receiver dimensions vary by manufacturer and model, so compatibility should be verified against the specific lower receiver.

Included Components:
The assembly includes the DPMS Gen 1-pattern upper receiver, 20" 4150 chrome moly steel HBAR barrel, 15" Gen 3 M-LOK handguard, rifle-length gas system, .750" gas block, and A2 flash hider.

Important:
This upper receiver assembly is not classified as a firearm when sold separately and does not require an FFL transfer under federal law. Applicable state and local restrictions may vary.

Ballistic Barn AR-10 upper assemblies are assembled in Texas using components manufactured for large-frame AR platforms. Each barrel is individually checked for proper headspace using Manson GO and NO-GO gauges before shipment.