Upgrade parts CM16

[Matty_22]

Hi everyone, I've recently bought a CM16 off here an the guns great. Was just after some info on where to buy upgrade parts to? How do I know what to get? What's the best type to get? An where would I get instructions to doing it or how hard is it to do?

Thanks ppl.

 

[M_P]

Madbull inner barrels and hop robbers are always a good bet, look on action hobbies and fire support