Help with basic upgrade

I have a KART M14 JAE that I want to upgrade internally. The only problem is that I have no idea where to start and what to upgrade. Any help would be appreciated

well you could start off by just upgrading your barrel to a tight bore. doesnt require too much work or tech knowledge to do. after that if your internals aren't cheap or even worse... plastic. you could upgrade the spring. the tightbore would increase range, accuracy, and grouping, and the spring would just increase range, and speed.

so i would just go with a tightbore.