Universal Caliber：. UNIVERSAL CALIBER COVERAGE Fits a wide range of handgun and shotgun bores, including popular 9mm. 22. 30. 38. 40. 45. 50. 410, 20GA, and 12GA for versatile cleaning needs. SMOOTH AND SAFE CLEANING ACTION Spiral-wound construction increases internal bore while maintaining a barrel-safe brushing experience without harsh abrasion.