Old Player Returning (Gun Maintenance)

[Pythagoras18]

Hello,

I used to play a lot when I was younger but the last time I played was about 6 years ago but I want to get back into it.

As such my old Cyma MP5 AEG hasn't seen any action in those 6 years.I'm assuming I'll need a new hop rubber but is there anything else I'll need to do/replace to make sure my gun is ready to go for game day?

Cheers for any help!