Scheels Outffer's military style chamber Brush cleans both the chamber and Star Chamber/ locking lug recesses of your AR15/M4/M16 platform rifle. The longer smaller part of the brush reaches the chamber area, while the larger diameter is meant to reach the star chamber/ locking lug recess area.  Designed for tactical competition shooters to withstand frequent use.  Heavy-Duty construction stainless steel skirt cuts through tough fouling in locking lug area.