The snapfire 8 is and 8 shot semiautomatic pistol. The trigger pull primes the spring, turns the turret and fires the dart. This is out in some countries but not in the US and hasbro has confirmed that it (and the stockade) will not be released in the US this year.
As you can see from this pic the snapfire 8 is actually powered by a extension spring rather than a compression spring. The spring can be adjusted by the knob on the bottom of the grip or by the switch in the grip.
