CMMG GAS TUBE KIT MID W/PIN

Description

A mid-length gas system sits at a practical middle ground between carbine and rifle configurations. By tapping gas from the barrel farther down the bore, it gives the expanding propellant gas more time to bleed off before the bolt carrier begins its rearward travel. The practical result is a softer, more gradual recoil impulse compared to a carbine-length system, which taps at a higher-pressure point and drives the carrier back more abruptly. That characteristic makes mid-length setups a common choice for 16-inch barreled AR builds where smooth cycling matters as much as compactness.

CMMG’s Gas Tube Kit is machined from stainless steel, which resists the heat and corrosion that gas tubes are exposed to with every round fired. The tube is bent at the correct angle and position for mid-length geometry, so it aligns properly with a standard mid-length gas block without adjustment. Critically, the kit includes the roll pin needed to retain the tube in the gas block — a small detail that matters when you are mid-build and do not want to hunt down a separate part. Whether you are assembling a new upper from scratch or replacing a tube that has seen hard use, everything required for installation ships together.

This is a straightforward, functional part for anyone putting together or maintaining a mid-length AR platform. CMMG produces it under their Build & Replace line, which signals its intent as both a builder’s component and a reliable spare for existing rifles.