I just bought and mounted the Tikka rings (not Optilocks) on my Whitetail hunter and they are really great. Have the recoil pin for the front too ( I was wondering what that grove on the top of the receiver was for!). They have ridges inside the ring and square locking dowels where the ring pieces meet. Seems to be very solid and only about $40 (same price as the Warne' s I believe).