Abstract: A pneumatic gun designed to provide uniform, constant acceleration to a projectile which includes a gas storage tank designed to store a blend of gases under pressure. The pneumatic gun also includes a buttstock that includes a pre-chamber storage vessel in fluid communication with the storage tank. The pneumatic gun further includes a sleeve valve in fluid communication with the pre-chamber storage vessel and designed to control flow of the blend of gases from the pre-chamber storage vessel into a nozzle located adjacent the sleeve valve. The nozzle is shaped to accelerate a velocity of the blend of gases across an axial length of the nozzle. The pneumatic gun also includes a trigger that is designed to open the sleeve valve when the trigger is actuated such that the sleeve valve remains open until a projectile exits a barrel of the pneumatic gun.

Abstract: A device for shutdown of an internal combustion engine which provides for the cessation of fuel and air mixture in a carburetor supplying the cylinders of the engine with fuel for ignition. The device features a conduit in sealed engagement with the fuel supply bowl of the carburetor which may by switched from engagement between the atmosphere or a negative air pressure supply. When switched to communication with negative air pressure the device causes a vacuum in the fuel bowl of the carburator thereby ceasing fuel flow and shutting down the engine due to lack of fuel.