No matter how cool we think we are with our gun handling, complacency is a constant and implacable enemy. A lot of shooters mistakenly think “good trigger pull” is synonymous with “light trigger pull,” and that ain’t necessarily so.
Check out this article by my old friend Ralph Mroz, a very capable self-defense firearms instructor: https://thestreetstandards.wordpress.com/2019/03/12/sigh-why-light-triggers-arent-recommended/ . Follow the links, and the links within the links!
All I have to add is this: on any defensive firearm, a so-called “hair trigger” – lighter than factory specification for “duty” use, or lighter than “common custom and practice” among those who routinely carry such firearms in harm’s way – a big concern is that the ultra-light trigger feeds into wrongful allegation of culpable negligence even when the shot was intentionally fired in self-defense. A politically-motivated prosecutor or a greed-motivated plaintiff’s lawyer knows that once established, self-defense is “a perfect defense,” but there is no such thing as a “justifiable accident.” It’s a lot easier for either of them to convince a jury that a good person became careless and did something stupid than to convince them that a good person suddenly turned into Jack the Ripper with a gun instead of a blade. I’ve seen that dirty trick played many times in what is now over 40 years as an expert witness for the courts in shooting cases. It’s a lot easier to convince a jury that a “hair trigger” gun went off by indefensible accident than a gun with a duty-weight trigger.
PLEASE read Ralph’s article. Please follow all those links. Reality as opposed to wishful thinking is a hallmark of Ralph Mroz’s work, and this article of his and all his references are important. Thanks to Ralph for writing it, and for mutual friend Grant Cunningham (https://www.grantcunningham.com/ ) for bringing it to my attention.