Trip- I could show you one............
But then I would have to kill you.....
It was designated the QSPR (Quiet Special Purpose Revolver) Looked like a Mdl 29 with a VERY short smoothbore barrel, bobbed hammer, no sights.
The real key was the ammo- a captive piston cartridge. On firing the steel cup was driven forward but stopped at the case mouth, containing all gasses. The projectile was a plastic sabot holding 15 tungsten balls, .5 grains each. Lethal range about 30 FEET, MV about 730 fps. Sound level
comparable to a suppressed 22 pistol.