I have a DIP CZ scope rail #19008 and adjustable sear #19000 that I am not using. Rail is perfect and adjustable sear is near perfect only because it does not include the extra ball bearing and roll pin. You will have to reuse yours out of your 455. Both will function 100%. I went another direction for a trigger on my CZ and had a set of rimfire rings I ended up using. Will sell both for 50 shipped. Can text or email pics, I cant seem to upload from my computer anymore.