Hello everybody, this is my first post here ! I am about to buy a .308W SSG-69 PII rifle, but in my country nobody sells STEYR scope rings. Looking at the receiver, I think the dovetail is quite similar to the CZ-550(19mm CZ vs. 18mm Steyr). Of course, the CZ rings have a side locking tab in the rear mount that should be ground off, in order to slide freely on the SGS dovetail. Has anybody tried CZ mounts ? Regarding the optional picatinny rail, does it require drilling the top of the receiver ? I will appreciate any light on this matter.