Otis Bore Brush #17 17hmr-4.6m - 1-nylon 1-bronze 5-40 Thread

The Otis Bore Brush #17 17HMR-4.6mm with 5-40 thread is a precision cleaning tool engineered for shooters who maintain rimfire rifles and small-caliber centerfire firearms. This dual-brush system is essential for law enforcement, military, competitive shooters, and serious gun owners who understand that bore maintenance directly impacts accuracy and firearm longevity. Whether you're running a .17 HMR, .177 air rifle, or 4.6mm platform, this brush set delivers the reliability required for consistent performance downrange.

Built by Otis, a trusted name in tactical firearm maintenance, this bore brush set features one nylon brush and one bronze brush, both sized at 1 inch in length and threaded to the industry-standard 5-40 specification. The dual-brush approach is critical: nylon bristles are gentler and work well for initial debris removal and between-shot cleaning, while bronze bristles provide more aggressive scrubbing action to break up stubborn fouling and carbon buildup. The 5-40 thread design integrates seamlessly with Otis cleaning rod systems and universal gun cleaning kits, ensuring compatibility across multiple shooting platforms and maintenance setups.

Field shooters who rotate between .17 HMR varmint rifles and precision rimfire competition will find this brush set invaluable for maintaining shot-to-shot consistency and extending barrel life. The compact 1-inch brush length and lightweight design (0.05 lbs) make it ideal for portable cleaning kits, range bags, and tactical field maintenance. Use the nylon brush for routine cleaning cycles and switch to the bronze brush for deeper fouling removal during monthly or post-range sessions. Simply attach to your 5-40 threaded cleaning rod, apply solvent, and run through the bore with steady strokes—this approach has proven effective across military armorer programs and law enforcement firearm maintenance protocols.