if you're looking for a decent scope at a moderate price you might try this one out. it was only 22 bucks so its nothing spectacular but it sure does its job. it sits pretty low on your gun so center of the bore to the center of the glass is only about an inch or so. the parallax is set at 50 yards though, thats the only problem. eye relief is 2.5", and the scope is about 11", and the tube is about 3/4". the view through it isn't round like most scopes, it looks like you're watching tv lol. the windage and elevation knobs are only movable with a flathead screwdriver, and kept safe under screw on/off caps. it says on the back of the package its for rimfires and air guns but i put mine on my .22 for now since the scope that came with my pg is SICK, but i just wanted to do a quick overview of this thing for anyone looking at scope options