Otis 223/5.56 Chamber Brush

The chamber is where an AR-15 collects the fouling that turns into extraction trouble, and a bore brush cannot reach it. This Otis brush runs tapered bronze bristles that scrub the chamber, neck and shoulder, with steel bristles at the base to cut the carbon out of the star chamber around the locking lugs.

The brass stem is cold welded to the core rather than crimped, and the tip is folded instead of cut, so there is no sharp wire end riding against the chamber wall. Standard 8-32 thread fits common cleaning rods and Otis cables.