You can mount a Picatinny rail on your Brno ZKM 451 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 fits the Brno ZKM and ZKM mod. 1. Tighten the screws to 2 to 2.5 Nm.