I plead ignorance...I need some help. I'm not at all familiar with scopes on shotguns, but want to put one on my new SBE II. What do I need as far as bases? I actually asked one of the guys in Gander Mountain today, and he looked at me like I had two heads. He had no idea what I needed, and it wasn't in his book yet, so I left with nothing. Anybody have any guidance?