A Picatinny rail lets you use any Picatinny scope rings or mounts on your CZ 452 or Brno ZKM 452. All rails here are steel, 0 MOA, with screws included. Tighten them to 2 to 2.5 Nm. Choose the rail that lists your rifle:
Contessa rail: for the CZ 452 and CZ 455. Made in Italy.
JK-N rail 11 mm: for the Brno ZKM 452 with an 11 mm dovetail. Made in the Czech Republic.
JK-N rail 16 mm: for the Brno ZKM 452 and ZKM 456 with a 16 mm dovetail, and the ZKM mod. 2 and mod. 4.