If your rail is the first pic, your going to need either a Scout or pistol scope with an extended eye relief, or a red dot. A standard eye relief scope isnt going to work.
I agree with FirstFreedom, the Ultimak/red dot combo is the way to go. If yours is solid, and holds zero, it may work as well.
“The enemy is anybody who's going to get you killed, no matter which side he is on.” ― Joseph Heller, Catch-22
Beware of associating with "Cheap" Squirrels. They tend to be very narrow minded, hypocritical, and will gag you if you question or disagree.