Re: Vortex viper scopes?
Can't go wrong with the Viper. Here's my experience with my 6.5-20x50mm.
I bought a used one here on the Hide last year. I used it for around 400+ shots and noticed the zoom ring was maybe a little loose. I just never noticed it so I figured I would ask their tech support. They put an engineer on the phone, and we went over the symptoms, he said to send it in. I was waiting on another rifle build at the time so I said why not. They emailed back that the movement was outside of spec and they would send me a new scope. I asked for the mil-dot version which hadn't been released yet and they made the swap! Sent me a brand new Mil-Dot.
I've shot another 500+ under this one and its perfect. The used scope I had before performed perfectly as well. Clicks, zoom, returned to zero every single time. The zoom ring just could be whobbled if forced. Probably still better fit then any other scope I've used.
Lastly, if you're goign to get one, go thorugh Scott at Liberty Optics. I picked up a DiamondBack for my wife and its awesome as well. Scott gave me a great deal and the scope has worked great. Between Liberty Optics and Vortex Service, its probably the best purchase plan you can get.
good luck!
Mike