As I am sure you all know, dry-firing a Glock is the way to field strip it, and as such, it is designed for "dry-fire"....
Now, if you hold that trigger back, and move the slide a bit ( 1/4 inch, or less...)
you can now let loose the trigger slowly to experience the "re-set" feature of that trigger...and dry-fire again.
Maybe some other pistols can do this, too, I only know it's a fact about Glocks.
"........woe...black Betty...bam-a-lam.........."........I am noww
out