CMMG 300 Blackout 16.1" Carbine Barrel 4140 CrMo

CMMG 300 Blackout Barrel Assembly

This CMMG barrel sub-assembly is purpose-built for AR-15 upper receivers and delivers the reliability you expect from a quality manufacturer.

Key Features

• Caliber: 300 AAC Blackout
• Barrel Length: 16.1 inches
• Twist Rate: 1:7 (optimal for subsonic and supersonic ammunition)
• Material: 4140 Chromoly steel
• Finish: Salt bath nitride (superior corrosion resistance and durability)
• Profile: Medium taper carbine length
• Extension: M4 barrel extension properly installed
• Threading: 5/8x24 (standard for suppressors)

Why This Barrel Works

The 300 Blackout has become the go-to cartridge for suppressed shooting and short-barreled rifles. This CMMG barrel is pre-headspaced and ready for assembly into your upper receiver. The salt bath nitride finish provides excellent protection against corrosion while maintaining a professional appearance.

The 1:7 twist rate handles both subsonic and supersonic loads reliably, making this barrel versatile for various shooting applications. Whether you're building a home defense rifle, a suppressed hunting platform, or a range gun, this barrel delivers consistent performance.

Assembly Ready

The properly installed M4 extension and pre-headspaced chamber mean you can focus on finishing your build without worrying about critical measurements. This is quality American manufacturing from a brand trusted by shooters nationwide.