Recent discussion for triggers on these two has got me looking again. I have a Brno Mod 2 where the trigger has been worked on - lot better than it was, but still not as good as the trigger on the Heym. I am looking at installing the Timney Trigger - http://www.midwayuk.com/apps/eproduc...eItemID=677306, which fits into the trigger housing using the tigger and sear pin.
If you have a CZ452 in 22 pr please can you pull the stock and measure the distance between the trigger pin and the sear pivot pin. on my Mod 2 the pins are 3mm in diameter and centre to centre distance is 29 mm. Does the CZ452 use the same centre to centre distance.