I have this one on my ML barrel for my TC Pro Hunter. It's for rifles but it works perfectly. Has a little more than 3 and a half inches eye relief and a 2-7 var power is plenty. I keep mine on 2 since I mostly hunt wooded areas but if I need to reach out to 150, which my ML is more than capable of, it's plenty of power at hand. And one thing I really didn't expect from a 32mm OBJ was the freaking clarity. Thing is bright and clear. Absolutely excellent light collection.

http://www.nikonsportoptics.com/Niko...-Nikoplex.html