Originally Posted by kalnaren
You don't need to oil the hop-up. Purpose of the hop-up is to create friction. Purpose of oil is to reduce friction.
Only thing the JG would really need is metal bushings if it doesn't have any. Otherwise you'll be fine using it stock for a while.
I was under the impression that all JGs came with metal bushings aside from the very earliest releases a couple years ago. Heck, some of them even come with ball bearing gears.