1/2" barrel.
1" modded sprinkler valve.
1" chamber.
Schrader valve fill point.
Silencer..Works to an extent.
Great little gun,small but it can pack a punch I was amazed when I droped about 15 4mm BBs down the barrel in some Tiolet papper wadding.Went through my target and into my back stop and through my back stop and was stopped by the wall.Ohh and this was in a bike shop were I was showing my product for sale..And it worked






