So I just purchased my first AR. It's a RRA Varmint A4, and I love plinking with it. Seriously fun gun. The only problem is, even with the stock fully extended, I feel like I have to pull my head back to get a decent site picture through the scope. The rings are set as far forward as possible, and the scope is set in the rings as far as possible. I'm a self confessed newbie in the AR world... any suggestions?