bigmatt said:
Most CZ75s are standard DA/SA operation. The exceptions being the single action only models: cz75b SAO, Shadow SAO, Tactical Sport and the Czechmate. The safety equipped models can be converted to SAO with a SA trigger. Most of the SAO triggers have pre and over travel screws to limited the extra travel of the trigger. To get an super short awesome SAO in a CZ75 it is best to start with a model without a firing pin block (pre B, 85C, TS, or a Shadow) or to remove it completely along with the SAO conversion.
I converted a transitional CZ75 pre B to SAO with some parts from CGW and CZ Custom and it is the best trigger of anything I own. I've never shot a 1911 with a trigger this good. My Hi Power clone trigger is junk compared to my upgraded CZ pistols.
Some additional points for those less familiar with the CZ design and SA mode: you can convert a 75 or 75B to SA by simply removing the disconnector. That's all that's needed. (Or you can simply ignore the DA function; internally, there's very little difference ... one part.)
I'm sure
bigmatt understands the following issue -- but others reading here might not: changing the trigger alone won't do it... as the gun is still DA/SA until the disconnector is removed -- and the longer SA trigger won't let the gun function in DA mode.
There have been several different SA CZ triggers available over the years, so someone wanting to do the conversion should be sure that he or she gets the two-way adjustable (for take-up and over-travel) metal trigger. (There were some offered that didn't adjust for take up, and others that were plastic. I've still got one of those plastic beasts in my parts bin.)
The fact that the pre-Bs don't have the extra linkage for and function OF the firing bin block makes for a subtly better trigger. Another feature that I don't think can be used on most DA/SA 75s or 75bs is the ambidextrous SA safety levers, which are much larger and easier to use than the standard CZ safety lever. (They will probably work on the stainless models and the 85 B [or 85 Combat], which have ambidextrous safety levers.)
The from-the-factory SA guns have slightly different frames and slides than the DA/SA models: the frames have a different, extended beavertail, and the slides have longer rails (which may or may not be truly functional.) The .40 versions also has a full-length guide rod. As noted above, there are different triggers, as well.
Some of the after-market parts from the CZ Custom Shop and Cajun Gun Works (like the new hammers) greatly improve the action of the gun.