.300 Blackout AR 15 Pistol Upper Assembly – 7.5″ Parkerized Heavy Barrel, 1:8 Twist Rate with 6.5″ MLOK Handguard

Optimized for subsonic accuracy.
Featuring a 7.5″ heavy barrel with a 1:8 twist rate, this 300 Blackout AR-15 upper provides the perfect combination of parts and specifications to ensure all subsonic loads are stabilized for maximum accuracy. Included is an upgraded, custom billet upper with a side-charging bolt carrier group for improved ergonomics.
What’s Included
This is not a firearm. It includes an assembled upper receiver, bolt carrier group, and charging handle. 
300 BLK Pistol Upper Assembly Specs
Barreled uppers are assembled in-house before shipment.
Barrel
Chamber: .300 AAC Blackout
Contour: Heavy
Length: 7.5″
Twist Rate: 1:8
Gas System: Pistol
Gas Block: 0.750″
Muzzle Threads: 5/8×24
Feed Ramps: .30 Cal
Material: 4150 CMV
Finish: Parkerized
Process: Button Rifled
Lining: None
Extension: M4
Muzzle: Fluted Flash Hider
Handguard
Attachment System: 6.5″ M-LOK
Finish: Type III Hardcoat Anodized (Mil-Spec)
Top Rail: M1913 Picatinny
Material: Billet 6061-T6 Aluminum
Attachment: Barrel Nut 
Upper Receiver
Profile: M4 Flattop
Material: Billet 6061-T6 Aluminum
Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
Profile: M16/Full-Auto
Steel: AISI E9310
Exterior: Black Nitride
Interior: Black Nitride
Gas Key: Staked
Charging Handle: Included, Right Side Charging
Lower receiver assembly sold separately.