I have not yet returned my rifle to the service center. I wanted to at least shoot it first and see if I even needed the picatinny rail. Along with the rifle I have also purchased one extra 10 round magazine and two promag 25 round magazines. Unfortunately I was having so much fun shooting I failed to notice when the scope started walking backwards, but it did move backwards. I was thinking I must have moved my eye closer to the scope when I finally noticed the scope had moved closer to my eye. So, I guess I will box it up tonight and get it in the mail (UPS).
As a side note, it was really fun to shoot and the promag magazines worked as advertised. There were zero failures and the last shot hold open worked every time.