Mine has a smooth bore, but not sure if the valve is the same or not. It also has (had) a relief valve off the bottom of the main valve to de-tune it to <500 fps. The relief valve has since been removed and the hole was soldered in. I keep it in the gun safe and treat it as if it were a non-restricted gun. I've never tested it but it is quite "snappy" now. I've had it since the early 80's.