This clever piece of equipment convert 12 bore /gauge shotguns to take .22 blanks. The converter fits in the barrel of the shotgun and the .22 blank fits in to the converter. A really good piece of equipment saving money on shotgun cartridge blanks while still being able to allow your trainee dog to associate your shotgun with noise. Also great to help train gun wary dogs close in, as the noise isn’t quite so loud in comparison to the real thing, allowing a gradual build up of noise giving the dog confidence in the field. Supplied with a removing tool in case it is necessary but generally ejects as with a normal cartridge. Proofed.