Depends what you're doing with it.
If you're preforming a criminal activity with it, You'll be charged as if it were a real firearm.
A more realistic situation would be getting pulled over on the way to a game and giving the officer permission to look in your gun case.
The most probable thing that'll happen is he'll inspect it, realize it's not real-firearm, you'll explain what it's for and he'll tell you to have a nice day.
Gun Technician and Tuner
Well versed in every AEG version and all major gas and spring systems.