8.5" 300 Blackout Upper - CMV HBAR Barrel - Gen II 7" Rail

8.5" 300 Blackout Upper for AR-15 with Chrome Moly HBAR Barrel and Gen II 7" M-LOK Rail

The 300 Blackout was engineered for exceptional performance from compact AR-15 platforms while reliably cycling both subsonic and supersonic ammunition. This 8.5" upper features a durable chrome moly HBAR barrel, pistol-length gas system, and Gen II 7" free-float M-LOK handguard for outstanding reliability, suppressor compatibility, and compact handling. It's an excellent choice for AR-15 pistol builds, short-barreled rifle configurations, and shooters looking for maximum maneuverability.

Quick Glance:

Caliber: 300 Blackout
Platform: AR-15
Barrel Length: 8.5 inches
Barrel Material: Chrome Moly Steel
Barrel Profile: HBAR
Barrel Finish: Parkerized
Twist Rate: 1:8 Twist
Gas System: Pistol Length
Handguard Length: 7 inches
Handguard Type: Gen II Free-Float M-LOK
Upper Receiver: Forged 7075-T6 Mil-Spec AR-15 Upper
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 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:
8.5" 300 Blackout barrel manufactured from durable 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 M4 feed ramps, and is professionally headspaced using Manson GO and NO-GO gauges. The pistol-length gas system is optimized for dependable cycling with both subsonic and supersonic ammunition, making this upper an excellent choice for suppressed and unsuppressed shooting.

Handguard:
Gen II 7" carbine-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 lights, grips, 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 featuring a durable nitride finish. This gas system is optimized for reliable cycling with both subsonic and supersonic 300 Blackout ammunition while delivering smooth operation in suppressed and unsuppressed configurations.

Muzzle Device:
A2 flash hider installed with a crush washer to help reduce visible muzzle flash while protecting the muzzle threads.

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.