This is a complete 7.5″ AR-15 barrel assembly chambered in .556 NATO, a key component for building a compact, close-quarters firearm. It’s designed for the builder who wants a ready-to-install upper receiver core without the hassle of headspacing or gas system alignment. The barrel comes pre-assembled with a low-profile gas block, tube, and a 7″ slim M-LOK handguard, so you can mount it to your upper receiver and be ready to go faster.
Key Features
- 7.5″ Chrome Moly or 4150 Steel Barrel with a 1:7 twist rate, optimized for stabilizing heavier .556 and .223 projectiles.
- Complete Assembly includes a pinned low-profile gas block, gas tube, and barrel nut installed to proper torque specs—no gunsmithing required.
- 7″ Slim M-LOK Handguard provides a lightweight, rigid platform for mounting grips, lights, and other accessories directly to the rail.
- Carbine-Length Gas System is correctly configured for this barrel length, ensuring reliable cycling with standard ammunition.
- Ready to Install onto any mil-spec AR-15 upper receiver, saving significant time and tools compared to a from-scratch build.
Built For
This short-barrel assembly is ideal for constructing a compact, maneuverable PDW or truck gun where size is a priority. It’s also a perfect fit for builders seeking a simple, no-fuss upgrade path for an existing upper or a fast start to a new pistol or SBR project.
Specifications
- Caliber: .556 NATO / .223 Remington
- Barrel Length: 7.5 inches
- Twist Rate: 1:7
- Gas System Length: Carbine
- Handguard: 7-inch Slim M-LOK, likely constructed from 6061-T6 aluminum.
FAQ
Is this barrel assembly compatible with any AR-15 upper receiver?
Yes, it is designed to fit any standard mil-spec AR-15 upper receiver. You will need a barrel wrench and vise block to install it properly.
What is the advantage of the 1:7 twist rate?
A 1:7 twist rate is ideal for stabilizing longer, heavier bullets (typically 62 grains and above), which are common in military-spec .556 ammunition and many defensive loads.
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