Today i successful finished the 6k-RPM build. Now I know that there is not much interest in these things nowadays but, I thought Id share it anyway. But first, "thanks", to all the OG members who've been contributing for a decade.
Some of the mods:
Threaded barrel to mag face (cut breach nut in half and welded it to the magazine face)
Hopper fill chute, so mag doesn't require removal for filling. Can safely hang a 90ci now from the mag
Motor upgraded
Auger upgraded
Drive train ratio mod (ladder chain and 2 cogs)
Stiffer clutch spring
Bunch of porting from the valve to the regulator
It empties a 1600psi 13ci in like a blink
6k is stupid superfluous but i did it for the fun of it.