The Stern Defense 00645ACPBARREL161INCHD .45 ACP 16.10" Black Melonite 4150 Chrome Moly Steel Barrel is purpose-built for dedicated .45 ACP AR-15 platforms. Machined from durable 4150 chrome-moly steel and finished in Black Melonite, this 16.10" threaded barrel is designed to deliver reliable feeding, consistent accuracy, and long-term corrosion resistance in a rifle-length configuration.

This barrel features a 1:16 twist rate optimized for stabilizing heavier .45 ACP projectiles and a .578-28 threaded muzzle for use with compatible compensators or other muzzle devices. Ideal for range use, training, and general recreational shooting, it offers increased sight radius and velocity compared to shorter pistol-caliber barrels. Stern Defense’s attention to detail and precise manufacturing make this barrel a solid foundation for a dependable .45 ACP AR build.

Key Features:

• Manufacturer: Stern Defense
• Model: 00645ACPBARREL161INCHD
• Caliber/Gauge: .45 ACP
• Barrel Length: 16.10"
• Rate of Twist: 1:16"
• Barrel Material: 4150 Chrome-Moly Steel
• Finish: Black Melonite
• Threaded Barrel: .578-28
• Sights: No