Here is a service that you and every gunsmith in the world should be offering all shotgun shooters. But, because of a lack of proper instructions and tools, plus the fact that most shooters do not know that a cure exists, the correction has been offered by only a handful of aware gunsmiths. These men have made heroes of themselves (and money) in their trade areas. This, you too, can and should do. It is profitable . . . the guns need it . . . and the shooters want it! The trapshooting customer will love you, the skeet shooter will offer to beat up your enemies and the hunter will swear you have performed a miracle on his old Bess! By reworking an improper chamber you will reduce recoil, s Mfg: Brownells SPECS: 10, 12, 16, 20, .410 gauge Overall lengths vary from 3.75" (9.5cm) to 4.5" (11.4cm). Blued steel.