KleenBore MagBrush 9mm/10mm/40 Caliber/45 Caliber Handgun Magazine Brush - A go to brush for competitive shooters, law enforcement, military or wherever positive ammo feeding is critical. The patented KleenBore MagBrush cleans and addresses a commonly overlooked area of maintenance on magazine-fed firearms. Removes gummy residue, dust, dirt, and unburned powder from inside the magazine and well for quicker, easier magazine release and increased reliability for cartridge feed. FEATURES: KleenBore Exclusive Patented Design Improves magazine release and cartridge-feed reliability Designed or use in straight stacked magazines Made in USA