I have a set of rings which were sold for use on a Tikka (not Optilocks), but they are currently holding a scope on my CZ527 and they work well. The dovetail seemed to be the same size, so I thought I'd try them...no problems so far. However, the recoil stop-pin that was intended to project down into the recess on the Tikka rail would not function with the CZ half-slot, so I simply screwed it up into the base of the ring until it was flush. My CZ is a .223, so recoil is not a concern for me...on chamberings that develop more recoil this might become an issue. Do Optilocks have a similar pin? And if so, can you remove or defeat it if required?