What mods are done to the 392? I was thinking about making a flat top piston and valve cap for mine with a little greater internal volume. If my 392 made it into 8-900 fps range especially with 18 jsb pellets id be ecstaticWell, at the high end, my Steroid 392 develops close to 30 fpe at 20 pumps with heavy pellets and my .25 Aspen makes around 36 fpe for every 6 pumps. So long as a multipump can make around 16 fpe though, I consider it adequate.
The Aspen is really the gun that should have checked all the boxes for being this ultimate pumper, but they really weren’t built very well and had a lot of issues of their own.
I think that the concept of an air conserving pumper is a very good one. There’s just so much efficiency to be gained by not dumping all the air with every shot and we’re at a point with PCP rifles these days where variable power can be achieved easily by controlling the hammer or transfer port.
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