Breakthrough Clean Technologies® Phosphorus Bronze Bristle Bore Brush - .40 Caliber & 10mm Product Features • GUN CLEANING BRUSH: This .40 Caliber & 10mm bronze bore brush features a #8-32 thread, rugged brass core and stiff bronze bristles to attack heavy carbon build-up in your firearm. Our gun brush is a handy accessory to add to your handgun cleaning kit. • BRONZE BORE CLEANER: One of the best things about our gun brushes is that they don't scratch when cleaning and maintaining your guns. It
