mine had a tin little box on it . i un bolted it back down to bare outlet and got a mate to make a plate and weld a tube onto plate and drill holes and bolt that onto outlet then attatch heat proof hose
doesnt realy matter what size shell you use what matters most is distance it only takes a pellet in the right place . i use too use victorys no5 35g shot pheasant pigeon rabbit fox up to 25 yard when walking the woods so yea to allrounder