Self resetting compressed gas valve

An air gun comprising:

• a main valve assembly for selectively providing compressed gas, said main valve assembly comprising:
• a housing forming a shot plenum and a switch plenum, said shot plenum having an inlet and an outlet, said shot plenum configured to receive compressed gas via the inlet and provide the compressed gas via the outlet, said switch plenum having a control port;
• a main valve configured to seal the outlet of the shot plenum when the main valve is in a forward position;
• a spring configured to bias the main valve toward the forward position of the main valve;
• a switch configured to separate the shot plenum from the switch plenum when the main valve assembly is assembled, wherein:
• the switch has a forward position and a rear position;
• the switch blocks the compressed gas from entering the shot plenum via the inlet when the switch is in the rear position;
• and
• compressed gas in the shot plenum biases the switch to the forward position;
• and
• a trigger;
• a actuation system configured to selectively vent the compressed gas from the switch plenum in response to a user pulling the trigger;
• and
• a barrel configured to receive the compressed gas from the shot plenum via the outlet of the shot plenum.