Stern Defense 9mm 4" AR-15 Barrel, 1:10 Twist

Stern Defense 9mm AR-15 Barrel

This 4-inch 9mm barrel from Stern Defense is purpose-built for AR-15 platforms chambered in 9mm. It delivers the compact profile shooters need for short-barreled rifles while maintaining reliable performance.

Key Features

• Caliber: 9mm
• Length: 4 inches
• Thread Pattern: 1/2-36 (standard for 9mm suppressors and muzzle devices)
• Twist Rate: 1:10 (optimized for 9mm projectiles)
• Material: 4150 Chrome-moly steel
• Finish: Melonite coating for superior corrosion and wear resistance
• Origin: Made in the U.S.A.

Performance and Durability

The 4150 chrome-moly steel construction provides the strength needed for reliable cycling and longevity. The Melonite finish is a proven hardening process that enhances surface durability and resists corrosion—ideal for shooters who demand consistent performance in various conditions.

The 1:10 twist rate is specifically engineered for 9mm ammunition, ensuring proper bullet stabilization across the full range of common 9mm loads. The 1/2-36 threading accommodates standard 9mm suppressors and muzzle devices, giving you flexibility in your setup.

This barrel is an excellent choice for building a compact, reliable 9mm AR-15 for home defense, target shooting, or recreational use.