A well-maintained assault rifle gas system provides smooth and reliable cycling for jam-free rapid fire. If it gets dirty, though, it can cause all kinds of problems. The hot gas can deposit residue and debris inside the tube, requiring regular cleaning. These disposable mops make it easy to clean out carbon deposits and other unwanted material from the gas tube of your AR15 or M16 rifle, as well as other hard-to-reach areas. The long, flexible shape provides plenty of reach, and provides enough scrubbing power to remove debris without damaging the weapon.