I know this is old, but Lonex does stuff that most good guns techs do. Machining V2 and V3 shells to fit things like 8-7mm bearings Bearings. Upgrade motors, gears, pistons and other pieces to bigger and more air compression generating components to get the most out of your gear box. Without going to far over a stock component and the best part they do it right from factory.. and sell each piece individually or as entire assembled gear box, so you can literally just break down the gun and swap the Gearbox..
Or if your a good gear head :P swap each parts as you break them.. However they are not the best for overall cranking Fps out of your gun that's Madbulls and a few other parts manufactures department. However I would still give it to Lonex because they tend to keep your gun field legal.
Don't get me wrong either, there are some things tho from madbull I like, that just give you more battery life and protect parts from strain ... like these babies.
http://madbull.com/catalog/index.php?main_page=index&cPath=21_42
and barrels that help increase accuracy.