CMMG Mid-Length Gas Tube with Roll Pin

The CMMG Mid-Length Gas Tube with Roll Pin is a precision-engineered piston system component designed for AR-platform rifles operating in mid-length gas configurations. This component is essential for maintaining reliable cycling and consistent bolt carrier group velocity across a wide range of ammunition and operating conditions. CMMG's mid-length gas tube delivers regulated gas flow to the bolt carrier assembly, enabling predictable recoil impulse and reduced carrier tilt during firing cycles.

Mid-length gas systems represent a functional balance between carbine-length and rifle-length configurations, optimizing port pressure for barrels in the 14.5- to 16-inch range. The included roll pin ensures secure attachment to the gas block, preventing unwanted rotation or separation under sustained fire. This component's dimensional specification—measuring 4.45 inches in length with a 0.45-inch diameter—conforms to industry standards for compatibility with standard AR-15 gas block assemblies. Proper gas tube alignment and pin retention are critical to maintaining the timing integrity of the piston-driven system.

Shooters building or servicing mid-length piston-driven ARs, whether for precision rifle applications, patrol configurations, or training platforms, depend on correctly matched gas system components. The CMMG mid-length gas tube pairs directly with CMMG-branded RipBurst piston systems and compatible third-party mid-length gas blocks. Replacement or spare tubes are essential maintenance items for armorer-level service and system troubleshooting. Weighing just 0.08 lbs, this component integrates seamlessly into build specifications without impact to overall rifle handling characteristics.