Birchwood Casey

Birchwood Casey 5.56/.223 Caliber MSR Chamber Brush (individual) Birchwood Casey MSR Chamber Brushes helps remove copper, carbon and lead fouling form rifle chambers. Thread size 8-32. Bronze bristles scrub the chamber, neck and shoulder of a MSR. The steel bristles at the base scrub the star chamber of the locking lugs on a MSR.