Here is a WGP STO kit with a Nitro Duck / Paintball Mania Supplies E Cocker kit on it.

These kits were introduced around 1997/98 and uses a mechanical / sear with an electro pneumatic switch.

Front block rotation showing the giant solenoids.

Find Autococker parts at https://www.baccipaintball.com/parts/semi/autococker.html

Find PMS and Nitro Duck history at https://www.baccipaintball.com/oldnews/tag/nitro-duck

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