Any1 Can advise me on upgrades for my G&G M14 ebr??

[ssxtour]

im using this on a non Sniper version so plain Assult rifle.
If any one out there who knows or got a link or a clip of how to install new inner barrel or motors ei. the simple task so i can do it alone first would be great.
Or advice on what inner barrel this g&g ebr use?
Motors
hop rubber etc etc please let me know or msg me.
Thanks
Kris