Breakthrough Clean Technologies® Phosphorus Bronze Bristle Chamber Brush - AR15, M16 and M4 Product Features • GUN CLEANING BRUSH: This tool features a rugged brass core and Phosphor Bronze bristles to attack residual carbon build-up in your firearm. Our gun brush fits .223 Caliber & 5.56mm MSR and is a must-have accessory to add to your firearm cleaning kit. • PHOSPHOR BRUSHES FOR CLEANING: Maintain and preserve your firearm for precise and accurate shooting. Our brushes will not scratch or mar
