Stern Defense .45 ACP 16.1 in Melonite Barrel

The Stern Defense .45 ACP 16.1-inch barrel is engineered for AR-style .45 ACP uppers. Constructed from 4150 chrome-moly steel with a Melonite coating, it provides corrosion resistance and surface hardness for extended service life. The barrel is threaded .578-28 to accept common muzzle devices and features a 1:16 rifling twist designed for .45 ACP projectiles. When paired with a carbine spring it requires an 11 ounce or heavier buffer and .45 ACP uppers need an enlarged ejection port for reliable operation.

Key Specifications

• The barrel is chambered in .45 ACP.
• The overall barrel length is 16.1 inches.
• Threading for muzzle devices is .578-28.
• The rifling twist rate is 1:16.
• Barrel material is 4150 chrome-moly steel.
• The exterior finish is a Melonite coating.
• This barrel is threaded for accessory installation.
• There are no sights integrated on this barrel.
• The barrel is not fluted.
• When used with a carbine spring it requires an 11 ounce or heavier buffer and .45 ACP uppers require an enlarged ejection port.

Durable and purpose-built, this Stern Defense barrel provides a solid foundation for AR-style .45 ACP builds used for precision target work and range duty. Its proven materials and finish, combined with standard threading and a conventional twist rate, make it a practical choice for shooters assembling or upgrading a .45 ACP upper where reliability and longevity are priorities.