CMMG’s 55D590A barrel sub-assembly is built for AR-15 upper group builds and comes with a properly installed M4 barrel extension. This 16.10in 5.56mm NATO midlength barrel is made from 416R stainless steel and finished in a stainless bead blasted surface for a durable, clean-looking build.
Key Features
Properly installed M4 barrel extension included with the sub-assembly
416R stainless steel construction
16.10in 5.56mm NATO barrel length
Midlength gas system for balanced cycling characteristics
Stainless bead blasted finish
Designed for custom AR-15 upper assembly builds
Upgrade or build your next AR-15 upper with a CMMG 55D590A barrel sub-assembly engineered for reliable fitment in standard upper builds.
