DoubleStar's 7.5" .300 Blackout HBAR Flattop Upper starts with their .300 Blackout chambered 7.5" HBAR barrel made from 4140 chrome moly steel utilizing the Pistol gas system. This nitrided barrel is attached to their flattop upper with their pistol length free floating aluminum handguards. The upper is fully assembled and all parts are completely made in the USA.
Specifcations and Features:
Caliber: .300 Blackout
Twist Rate: 1:8 Right Hand
Barrel Length: 7.5"
Barrel Type: Heavy Barrel
Barrel Material: 4150 Steel
Barrel Features: Black Nitride Finish, M4 Feed Ramps
Gas System: Pistol
Upper Receiver Type: Flattop
Upper Receiver Material: Forged Aircraft 7075 T6 Aluminum
Upper Receiver Features: "T"-Marks, Brass Deflector, Forward Assist, M4 Feedramps
Upper Receiver Coating: Anodized to Mil-Spec
Sight / Gas Block: Picatinny Rail Gas Block
Muzzle Device: A-2 Flash Hider
Handguard: Pistol National Match Handguard
Made in the USA
This upper receiver can be connected to any standard AR-15 pistol lower receiver. All NFA rules apply.