thumbcocker,
CZ trigger options; Timney, Rifle Basix, Automation solutions (an adjustable sear) and Yo-dave kits.
You should be able to find the first three at Brownells.
I've used the automation solutions sear on several rifles and bought one that had the yo-dave kit in it.
Lowest I went was about 24 ounces for the range. Was pretty darned light and crisp w/ no overtravel. Could have gone lower but it was safe there and I could see no advantage to going lighter.
Jerry