M16 & Ar-15 Chamber Brushes Brownells.
Original Mil Spec Chamber Brushes
Original military design, M16, with 8-36 thread for direct threading into the "Cleaning Rod, Small Arms", or AR-15 with 8-32 thread to fit standard rods. AR-10 cleans the larger .308 chamber used on these rifles. Bronze bristles fit chamber, longer, stainless steel tufts clean locking lug recesses.
AR-15, Issue:11, Page:080
Big Book Catalog, Issue:71, Page:083
Bronze Rifle/pistol Chamber Brushes Brownells.
Safely, Easily Cleans Dirty Chambers
The finest phosphor bronze bristles on a looped and wound shank; in sizes to correctly fit the chambers of most popular rifle and handgun rounds on the market.
1911, Issue:04, Page:058
Big Book Catalog, Issue:71, Page:340