Details
Cobalt Kinetics 7.5-Inch Pistol-Gas 5.56 NATO AR-15 Upper Receiver
This is a complete upper receiver assembly built around a compact 7.5-inch barrel designed for pistol-length gas systems. The upper pairs a 6061-T6 aluminum receiver with a 4150 chrome moly nitride barrel, delivering a tight, reliable platform for 5.56 NATO ammunition in a short-action configuration.
Key Features
- 7.5-inch 4150 chrome moly nitride barrel with 1:7 twist rate
- 6061-T6 aluminum receiver with Type II hard coat anodize finish
- Pistol-length gas system tuned for compact cycling
- 7-inch MLOK handguard for accessory mounting
- 1/2x28 barrel thread pitch for standard muzzle device compatibility
- Government profile barrel with 0.750-inch gas block
Barrel and Gas System Design
The 7.5-inch barrel length paired with pistol-gas cycling creates a compact, fast-cycling upper that handles rapid follow-up shots without excessive recoil. The 1:7 twist stabilizes a wide range of 5.56 NATO loads, from lighter target rounds to heavier tactical ammunition. This combination keeps the overall platform short and responsive while maintaining reliability across standard ammunition types.
Material Quality and Durability
Cobalt Kinetics uses 6061-T6 aluminum for the receiver, a standard that provides strength and consistent tolerances across production. The Type II hard coat anodize finish protects against corrosion and wear during extended use. The 4150 chrome moly barrel with nitride finish resists fouling and extends barrel life, making this upper a solid choice for high-volume shooters.
Handguard and Accessory Compatibility
The 7-inch MLOK handguard offers plenty of real estate for mounting lights, vertical grips, and other tactical accessories without adding bulk. The 1/2x28 thread pitch accepts any standard AR-15 muzzle device, making suppressor integration straightforward when needed.
FAQ
What ammunition does this upper chamber?
5.56 NATO only. The barrel is specifically rifled for this cartridge and will not safely fire .223 Remington or other calibers.
Is this upper compatible with my lower receiver?
Yes, this is a standard AR-15 upper assembly. It will fit any mil-spec AR-15 lower receiver with standard trigger pin spacing.
Can I add a suppressor to this upper?
The 1/2x28 thread pitch accepts standard suppressors designed for 5.56 platforms. Verify suppressor compatibility with the manufacturer before purchase.
What handguard length is this?
The handguard is 7 inches long, leaving minimal overhang beyond the barrel. This keeps the overall platform compact.
Does this come with a bolt carrier group or charging handle?
No. This is an upper receiver assembly only. Bolt carrier group and charging handle are not included.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.
