Otis FG317NB Bore Brush Set 17 HMR/177 Cal Bronze/Nylon 5-40 Thread

The Otis FG317NB Bore Brush Set delivers precision cleaning for 17 HMR, 177 caliber, and 177 WSM firearms with dual-bristle technology that removes fouling without damaging rifling. This two-brush system combines bronze and nylon bristles on a single 5-40 thread for comprehensive bore maintenance.

What Makes This Different

Unlike single-material brushes that either scrub too aggressively or lack cleaning power, the FG317NB features both bronze and nylon bristles engineered for specific cleaning phases. The bronze bristles break down copper and lead deposits while nylon bristles sweep away residue without scratching the bore surface. Each brush measures exactly 1 inch in length, providing optimal contact with rifling grooves in small-caliber barrels.

Key Features

• Dual bronze and nylon bristle construction for complete fouling removal
• 5-40 thread pitch compatible with standard cleaning rods and handles
• 1-inch brush length optimized for 17 HMR and 177 caliber bore dimensions
• Two brushes per package for extended cleaning sessions
• Precision-wound bristles maintain shape through repeated use
• Compatible with 17 HMR, 177 caliber, and 177 WSM chambers
• Threaded brass core resists corrosion from cleaning solvents

These brushes handle the demanding cleaning requirements of high-velocity 17 HMR ammunition, which creates significant copper fouling at muzzle velocities exceeding 2,500 fps. The bronze bristles effectively remove this buildup while the nylon component prevents bore damage that can affect accuracy. Competition shooters and varmint hunters rely on this dual-bristle approach to maintain sub-MOA precision in their precision rifles.

Technical Specs

• Caliber compatibility: 17 HMR, 177 caliber, 177 WSM
• Thread specification: 5-40 male thread
• Brush length: 1 inch
• Bristle materials: Bronze and nylon combination
• Core material: Brass threaded shaft
• Package quantity: 2 brushes
• Manufacturer: Otis Technology
• Model: FG317NB

The FG317NB represents proven cleaning technology specifically sized for small-caliber precision rifles. Professional gunsmiths stock these brushes because they deliver consistent results without the guesswork of improvised cleaning methods.