I picked up a 22 hornet not long ago, stamped on the receiver ring CZ 527
on the left side of the receiver, like yours BRNO ARMS. its dated 1990. TOU and I descussed this one and believe it be a transitional unit from the FOX to the 527. It also has the double set triggers.
At the moment its getting a take off CZ hornet barrel that's been re chambered to 5.7 Johnson. Kept the original hornet barrel as is so TOU did'nt come and throw stones on my roof
Johno