Just converted my TM SOC16 into a full-length M14, added a bipod and scope/mount too.
TM SOC16
AGM M14 outer barrel
AGM Scope mount
Prometheus Soft Bucking
Systema M130
KWA Polycarb Piston
KWA Aluminum Piston Hear
Element H-nub
Gaurder metal bushings
G3 bipod (needs to be replaced by a harris... I know.)
Bushnell scope/rings
Effective range: 230 feet with the right BBs (bioval .27g BBBMAX). I could get more, all it will take is a higher FPS spring, but I'd be limited to semi auto at any field.
G&G L85
Prometheus 6.03 barrel
XYT Standard sector gear (prevents the longer piston from being drawn all of the way back so the sector gear won't hit it while it's still moving forward)
Unknown spring, found it behind AirsoftAtlanta along with some other stuff thrown out there. Shoots at 350 FPS.
A lot of people love to hate the G&G L85, but I love mine. If you replace the sector gear with a standard one and disable the blowback, it's just as reliable as any other disign. And it's a split gearbox, which is very nice. Also, I can cosistantly attain sub-3 second reloads (EI UCR and dump pouch) after a little practice.