sounds familiar, I think they've been supplying gears for clones since companies like Cyma started shifting away from LPEGs.
Originally Posted by Hortons Heros
Changing the spring for a TM stock raised the ROF but I'm not sure how much of that was the gears getting some good lube.
Stock TM springs are I think M90-ish? The ECHO1 springs are probably around M120, in order to do 340fps in a MP5K. So most of that increase has got to be the spring. Your battery life has gone way up, too.