13.9″ Ar-15 5.56/223 Upper (Legal rifle, 16″+)
- 13.9″ 4150 Chrome Moly (CMV) Barrel. (0.2 longer than 13.7″ for more muzzle device options).
- 1:7 twist.
- m4 feed ramps.
- 556 NATO Chamber (shoots both 5.56 and 223).
- Mid Length gas system
- .750 Steel Low Profile Gas Block.
- Dust cover, Forward Assist installed.
- Competition muzzle brake (differs from A2).
- 12″ Free Float M-Lok Handguard
M16 BCG & Charging Handle available in options. This comes professionally assembled and ready to go. If you order our BCG, we’ll test fire with that one prior to shipping.
Optimize your AR-15 with the MSF 13.9″ Pin & Weld 5.56/.223 Rifle Upper Assembly, engineered for enhanced maneuverability without sacrificing performance. The pinned and welded muzzle device extends the barrel length to a legal 16 inches, ensuring compliance with regulations.
Key Features:
- Barrel: 13.9-inch 4150 Chrome Moly Vanadium barrel with a 1:7 twist rate, suitable for both 5.56 NATO and .223 Remington rounds.
- Muzzle Device: Pinned and welded to achieve a total length of 16 inches, eliminating the need for NFA registration.
- Handguard: Free float M-LOK handguard provides a stable platform for accessories and improved accuracy.
This AR15 complete upper is ideal for shooters seeking a compact yet compliant rifle setup, offering reliability and versatility for various applications. Bolt carrier group and charging handle are available as optional upgrades.
