Uses? Same as any short barrelled defensive shotgun. The shorter the barrel the less effective it will be for field use, but the more handy it is for typical SD/HD scenarios (up to a point, of course). SD/HD distances very rarely exceed what? Maybe 10-15 yards? Beyond that you are getting to the point where convincing judge and jury your life, or those of your loved ones, was/were in danger starts becoming problematic. So a shotgun that is exceptionally handy while remaining exceptionally deadly out to 10 yards, up to perhaps 20 becomes a real asset. Obviously, we're not talking a field gun here, or a range gun, so those comparisons aren't valid. Short-barrelled shotguns are also easy to store while traveling and provide great manueverability inside a vehicle.