DoubleStar's Zero Carbine Upper starts with their 5.56 chambered 16" HBAR barrel made from 416 stainless steel utilizing the carbine gas system, sporting the Alpha compensator. This match barrel is attached to their flattop upper with their 15" Cloak M-LOK aluminum free floating handguard. The upper is fully assembled with charging handle and semi-auto bolt carrier group. All parts are completely made in the USA.

Specifcations and Features:
Caliber: 5.56x45 NATO
Twist Rate: 1:8 Right Hand
Barrel Length: 16"
Barrel Type: Wilson Air Gauged
Barrel Material: 416 Stainless Steel
Barrel Features: Free Floating
Gas System: Carbine
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: Low Profile Gas Block
Muzzle Device: Alpha AR Comp.
Handguard: Cloak MLOK Handguard 15.5"
Includes Charging Handle and BCG
Made in the USA

Fits:

AR-15 lower receivers