dual sector gear... been reading a bit about them... 2 shots fired for 1 trigger pull. The gear has 2 sets of teeth 180 degrees apart, setup to short stroke the piston... they generally run a heavier spring to compensate for a shorter pull to get in the 320~fps area. I think higher than that they start dropping rps.
60 Round Per Second DSG AEG. - YouTube
Anyways, back to highspeed motors with high torque gears... I haven't tried it, cause my tempormental p90 is getting something like 25-30 rps already with an 11.1 lipo with a matched high torque set... not sure what the real rof is exactly, I have to get my chrono back to find out... but I need to solve the feeding issue first. :P