I used two Nikon Force XRs, the first a fixed 2x power, then the 2.5-8x variable. The only reason I replaced the 2x scope was that I discovered I'm personally not a fan of fixed 2x magnification scopes. Both of them stayed in place and retained their zero despite the near-max loads I put through the gun. I only ever used two scope rings, but you might consider using three or four just to be safe.