Breakthrough Clean Technologies® Phosphorus Bronze Bristle Bolt Carrier Brush - AR15, M16 & M4 Product Features • GUN CLEANING BRUSH: This tool features a rugged brass core and stiff phosphor bronze bristles to attack heavy residual carbon build-up in your firearm. Our gun brush fits .223 Caliber & 5.56mm MSR rifles and is a must-have accessory for your firearm cleaning kit. • NYLON BRUSHES FOR CLEANING: Maintain and preserve your firearm for consistent, precise and accurate shooting. Our brushe
