Awsome so now i know where to start.
Ill just swiss cheese sorbo and shave a cpl teeth to start with for a minor increase maybe a slightly lighter spring. Id like to get around 350fps so i can also use it indoors. Then ill just start savin up and build a lonex bassed high speed gearbox to eventually drop in
This will let u mount a buffer tube not sure if itll assist u in mountin yer stubby stock tho.
http://shop.ehobbyasia.com/action-mp...marui-aeg.html
Good luck on finnishin up yer build lookin good so far.