-B BORE CLEANING COMPOUND Cuts Through Toughest Bullet Jacket & Powder Fouling - Can't-Run Paste Formulation - Cushioned Abrasive Action Leaves Bores Sparkling - Won't "Eat" Stock Finishes. J-B has been getting burned-on, caked-in powder residue and copper jacket fouling out of gun barrels since the 1960's, and hasn't damaged an inch of rifling yet. Today, J-B roves itself a champion by the way it easily cleans the dirtiest, moly-fouled barrels. A unique combination of ingredients and a one-of-kind, multi-step mixing process give J-B its special characteristics. They work together to cushion the abrasive action; the soft paste liquifies as you use it, then wipes out of the bore easily. The non-embedding feature means there's no abrasive residue left behind which might keep "cutting" after you've finished cleaning. J-B has been a favorite on gunsmiths' benches for years, as a "magic" cure for customer guns that "...just won't shoot anymore". These pros know that a good scrubbing with J-B often restores accuracy. Match and varmint shooters put a lot of rounds down range, many of those using moly coated bullets. The large amounts of copper fouling and the burned-in moly can create a cleaning nightmare; J-B makes short work of it. Use J-B with the Lewis Lead Remover to get the last speck of leading out of pistol bores. Shotguns combine lead, powder and plastic fouling to really throw patterns off; J-B cleans it all out quickly and easily.