This is one of the first multiple-paintball launchers, as far as I can tell. I'm not sure when these were produced, but I've never seen much information about them. They seem to be pretty rare. There were apparently two models of these; one looks to be a fairly simple two-ball-valve design, with a manually operated firing valve. Mine is the more "advanced" model, with a spring-triggered main valve that greatly increases the consistency over manual-valve launchers.
It works perfectly, and in fact I've used it as a Nerf rocket launcher at scenario games (a job it performs admirably). The person I purchased it from did not pack it adequately for shipping; I received it with the barrel snapped in half. I used PVC pipe fittings to repair and reinforce it; it should also not be difficult to restore, as the body/barrel is simply a length of PVC pipe.
All of the pressure-bearing parts are steel, including the 2 oz. pressure chamber, which appears to have been made from a small standard CO2 tank.
The grip frame closely resembles the one on the USI Raider pumpgun; this one is fitted with a Lonestar grip and a bottomline ASA grip block. I haven't tested the efficiency with a constant-air setup, but I can get 2 decent shots if I'm using a 12-gram cartridge.
For a small, lightweight scenario launcher that's not very expensive, it's surprisingly good. It would also be a pretty interesting (and rare) addition to a collection of early paintball tech.
$225, plus actual shipping. Contact me with your address at email@example.com for a shipping quote.