Mikeydog
Go to WGC and type ver.7 in the search box. That'll give you version 7 gears, tappet plate, anti-reversal latch and spring guide.
Now type ver. 7 (yes, ver._7) and get 2 cylinder heads.
Then search "m14". You'll find 2 cylinders and ver.7 nozzle along with some inner and outer barrels, mount bases, magazines etc. Just ignore G&G parts.
Piston, piston head and bushings are common ones.