You got the wrong gearset
U need a V7 gearset
http://www.wgcshop.com/pcart/shopper...etheus%20Parts
The set u got are for version 2 and 3
Everything looks good minus your Gearset since its the wrong version

The Airsoft surgeon stage 4 will put u at 500fps or very very close to 500fps
Thats the setup i run but i have clamped 2 of the rear coils together and blowtorched them to make me shoot 470fps
For piston Im using a systema piston head (durcan i think it is) and a deepfire piston
You may also want to get the Promethus Aero head to produce a better seal between the cylinder head and nozzle
Then your pretty much completely upgraded haha
OHHHH YAH
U need one of these
http://www.wgcshop.com/pcart/shopper...E0732_srch_M14
Or i did in my TM since that wore down insanely fast after my upgrades ~500 shots and I started to shoot burst/full auto