History and basic operation
Origin electropneumatic paintball
marker is the subject of a patent dispute, but it is generally
acknowledged to have happened more or less simultaneously with the
introduction of WDP Angel Shocker PneuVenture sold by Smart Parts, both
in 1996. The markers were used differently, they are similar insofar as
they both make use of one or more micro-controlled solenoid valves.

The Shocker used two control valves electro-magnet to obtain separate
controls on the ball loading sequence and the sequence of delivery by
air. The Angel uses a hammer and bolt attached, allowing the use of a
single solenoid to actuate the firing sequence while controlling a
piston fed the hammer bolt / forward at the same time chambering a
paintball and to release the propellant at the end of the stroke of the
hammer.

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