This undercocking Adventure Game Supplies Comp showed up on So Cal craigslist several weeks back. I tried to purchase it but Woouulf on mcb beat me. I ended up purchasing it from him several days later.
These were a rip off of The Carter comp or the NW Comp and feature a similar pump handle and undercocking system.
AGS made these from likely 1988-1989 with and aluminum (1st version) or delrin (second version) pump. but few were likely made compared to the mass produced devastator.
I have probably seen 2-4 of these.