Designed to cater to AR-15, M-16, M4 and similar MSR rifles, KleenBore presents the military style Chamber Brush, meticulously crafted for robust usage. This chamber brush features a core wire looped through a brass coupling, threaded at #8-36. Notably, the KleenBore military style chamber brush boasts a dual-brush design with two different diameters. The first stage, crafted from phosphor bronze, effectively cleans the chamber area, while the second stage, composed of stainless steel, efficiently cleans the bolt lock-up area. It's important to be aware that the #8-36 coupling doesn't adhere to standard thread sizes and may not fit most commercial cleaning rods. However, these chamber brushes are compatible with KleenBore multi-section rifle rods, specifically those found in the classic rifle kits, field pack kits (military style pouch kits) #POU301B, #POU302B, #POU302T and the all caliber vinyl pouch rod set (#S-170).