The CMMG 55DA3AC is a low-profile chrome moly steel AR-15 barrel designed for shooters building or upgrading their modern rifle platform. At 16.1 inches, this barrel length strikes a practical balance for tactical configurations, hunting setups, and range work—offering reasonable sight radius and velocity without the bulk of longer barrels. Chrome moly steel construction delivers reliable durability for both high-round-count training and field use, resisting wear and corrosion better than standard steel while remaining cost-effective compared to stainless alternatives.

The low-profile design means this barrel is compatible with standard AR-15 accessories and handguards without requiring special mounting hardware or modifications. Whether you're assembling a compact home-defense rifle, a lightweight hunting carbine, or a versatile general-purpose upper receiver, the 55DA3AC's dimensions and material profile make it a straightforward drop-in component for any builder's parts list.

CMMG's reputation for precision manufacturing and attention to AR platform standards means you can trust this barrel to chamber cleanly, headspace correctly with standard components, and deliver consistent accuracy. This is a no-frills, purposeful part—made to work in the real world without marketing hype.

Specifications

Frequently Asked Questions

Will this CMMG AR-15 barrel work with my existing upper receiver?

Yes. The 55DA3AC is a standard AR-15 barrel with a low-profile design, meaning it uses conventional AR-15 barrel extensions and will fit standard uppers and handguards without modification.

What's the advantage of chrome moly steel for an AR barrel?

Chrome moly steel offers excellent durability and corrosion resistance at a moderate cost. It's a proven material for AR barrels that performs reliably in both high-volume training and field conditions.

Is 16.1 inches a common barrel length for AR-15 builds?

Yes. The 16.1-inch length is well-suited for compact and versatile rifle builds, providing a good balance of velocity, sight radius, and overall length for tactical, hunting, and general-purpose applications.