Tribalscream, they're legal in Pa. Only sights that are not, to my knowledge, are lasers. The red-dot does not project a light on the animal so they're as legal as any other scope such as used on a rifle.
You can look them over, but I'd suggest one with no magnification so you can shoot with both eyes open. Otherwise you're sending the brain two different images. Brain can't do two things at one time. Also consider that looking through the tube cuts down on the amount of light transmission and limits your field-of-view.
Have you tried fiber-optics yet? Might be a better way to go. Most bright ones can be seen evern after legal shooting hours are up. I can actually see mine when I can't see where to aim on a deer due to darkness.
Just some thoughts to ponder. Good luck.