The Shark Coast Mongoose 5.56 16" upper receiver assembly delivers precision engineering for AR-15 platforms demanding consistent accuracy and reliability. This complete upper features a 16-inch barrel optimized for 5.56 NATO/.223 Remington cartridges, providing the ideal balance of velocity and maneuverability for tactical applications.
What Makes This Different
The Mongoose upper incorporates a precision-machined 7075-T6 aluminum receiver with M4 feed ramps for enhanced feeding reliability. The 16-inch barrel features a 1:7 twist rate, optimizing stabilization for heavier projectiles up to 77 grains. Unlike standard commercial uppers, this assembly includes a low-profile gas block and mid-length gas system for reduced recoil impulse and improved cycling consistency.Key Features
- 16-inch 4150 chrome moly vanadium steel barrel with 1:7 twist rate
- 7075-T6 forged aluminum upper receiver with M4 feed ramps
- Mid-length gas system with low-profile gas block
- 15-inch M-LOK compatible handguard with full-length top rail
- A2 flash hider with standard 1/2x28 threading
- Assembled bolt carrier group and charging handle included
- Compatible with standard AR-15 lower receivers
Technical Specs
- Caliber: 5.56 NATO/.223 Remington
- Barrel Length: 16 inches
- Twist Rate: 1:7 inches
- Gas System: Mid-length
- Overall Length: Approximately 32 inches
- Weight: 4.2 pounds (complete upper)
- Handguard: 15-inch M-LOK compatible
- Threading: 1/2x28 TPI
- Finish: Type III hard coat anodized
