5.25" .45 ACP Medium Black Nitride Barrel

5.25″ .45 ACP Medium Black Nitride Barrel

Compact power. Smooth performance. American-made quality.

The 5.25″ .45 ACP Barrel from Black Rifle Depot is a premium component crafted for blowback AR builds. Precision-machined from high-grade steel and treated with a durable black nitride (QPQ) finish, this medium-profile barrel offers excellent corrosion resistance, extended service life, and reliable feeding.

Designed for blowback operation, it requires no gas system and is ideal for AR-45 pistols or SBR configurations. The .578×28 threaded muzzle accommodates most .45-caliber suppressors and muzzle devices. With a 1:16 twist rate, it provides optimal performance and stability for the .45 ACP cartridge.

Manufactured in the USA by Tier 1 producers under ISO-9001 quality standards, this barrel meets strict tolerances and is built for performance and value.

Features

• 5.25″ barrel length – optimized for AR-45 pistols
• Blowback operation – no gas system required
• .578×28 threaded muzzle for suppressor compatibility
• Black nitride finish for corrosion and wear resistance
• 1:16 twist rate for accurate .45 ACP stabilization
• Medium contour for strength and balance

Specifications

• Caliber: .45 ACP
• Barrel Length: 5.25″
• Gas System: Blowback
• Twist Rate: 1:16 RH
• Muzzle Thread: .578×28
• Profile: Medium
• Finish: Black Nitride / Melonite
• Platform: AR-15 (.45 ACP configuration)