You can mount a Picatinny rail on your Brno ZKM 456 and then use any Picatinny scope rings or mounts. The JK-N rail for the 16 mm dovetail is steel, 0 MOA, made in the Czech Republic, with screws included. It also fits the ZKM 452 with a 16 mm dovetail and the ZKM mod. 2 and mod. 4. Tighten the screws to 2 to 2.5 Nm.