...a hybrid compromise decocker safety combination doo-hickey...
It's called a hammer drop safety.
DA/SA is nice too, but now the trigger behaves in a totally different way fromn shot to shot.
A
DA handgun does not exhibit "shot to shot" differences in behavior. The
DA handgun can be manually cocked to fire the first shot in
SA mode just like any
DA revolver, therefore trigger pull remains consistent between the first shot and subsequent shots, until the hammer is decocked.
Trigger pull remains consistent if the hammer isn't decocked after the first cartridge is manually chambered.
Finally, shoot a
DA automatic to slide lock, reload and, unless the hammer is decocked, trigger pull remains consistent.
If the hammer on a
DA automatic is not cocked, then pressing the trigger will fire the gun in
DA mode. Subsequent shots will be fired in
SA mode simply because the recoiling slide automatically cocks the hammer and the trigger mechanism operates in
SA. The transition from a long
DA trigger pull to a shorter
SA trigger pull is where differences in trigger characteristics occur between the first and second shots ONLY.
If a long, heavy first pull is the DA/SA's safety feature, why does it need an external safety like a SA?
Some people don't view it as a safety feature. I carried a
DA Beretta 96FS on police patrol and I carried with the manual safety engaged to extend the time a potential gungrabber needed to figure out how to get the gun running.
Now you have a trigger so light that even the manufacturer doesn't trust it, so they put a safety on it.
But you have a VERY CONSISTENT, PRECISE trigger. Pressing it does one thing - it drops the hammer. Many people prefer that.
Oops, I for got to take off the safety! Lets try again, take off the safety, pull the trigger and it goes... Darn, what now? Oh, cock it, take off the safety, then pull the trigger, and it goes bang.
People who prefer an
SA automatic, in my experience, know how to operate their gun intuitively. Draw gun, disengage safety. Train to do this everytime and it's second nature.
Likewise if a
DA is equipped with a manual safety it should be carried with the safety engaged so the shooter is forced to go through the motions to disengage it everytime.
Carrying a
DA handgun with the manual safety disengaged is a recipe for failure. In accordance with Murphy's Law, it will have been inadvertantly engaged moments before the shooter needs to draw his gun only to find that it won't fire.