Still following up with this thread because I think scope mounting issues affect many who have a BRNO 602 or CZ 550. The biggest issue I see for scope mounting for either rifle are the limitations of the large dovetail system and the recoil lug cut-out prevents flexibility for location of the rear ring.
I think the same specs are/were used for both the ZKK 602 and 550 receivers. So scope mounting issues will be similar. I remain unsure as to the necessity for QR type mounts- although they seem to be very popular. I can remove a scope mounted with simple rings/bases in a minute or less. Just loosen two screws with a driver or small L. werench- done. Many mounts without the QR levers are basically the same as those with levers- and they will return to pretty close to the same index point after remounting. I can't imagine having to quickly take a scope off for speed anyway- just doesn't makes sense. I'm trying to come up with a scenario to explain the necessity...
take first shot at DG, scope blows up,,, hurry, hurry, hurry, speed is critical to remove scope for followup shots??? To each their own imagination I guess. If I carry a small wrench or driver in my "kit", I can remove or reattach a scope with these simple type mounts every bit as easily as if there were levers and almost as fast. No matter the design, most shooters, me included, would want to take a shot or two after reattachment to check for "zero".
I have a BRNO 602 in 375 HH and used the simple Leupold ring mount bases to mount an older Leupold M8 4x scope. These Leupold mounts are simple and well designed and as a bonus, one of the least expensive for this application. The lines are clean, there are no extra "snags" hanging here or there, the system is strong, nothing moves under recoil, it is plenty quick (two torx head screws) to remove or reattach the scope. It will index upon reattachment as close as any other QR type system. BTW this rifle, I believe DOM of 1994, shows no scope mount-to-bore runout or POI issues as do some of the more current CZs apparently have.
I don't know how many inch pounds of torque I apply but it is quite a bit. The #8 screws seem plenty strong as I have tested them with excessive force with both a torx drive and the supplied torx L wrench and the head seems more likely to wallow out than for the screw to break. The torx size is # 15. I have noticed no peening or setback in the left rear lug, no movement of the mounts nor scope in the rings. The medium height rings provide plenty of bolt clearance with this scope. IMO, the high ring mounts of this model would be much too high for this set up especially with a BRNO stock that has a geometry for open sight use. The scope's eye piece is approx. 40 mm OD. The scope is mounted, rotated 90* left so there is minimal port interference for both ejection and loading.
Pics show setup.
