Quote:
Originally Posted by TLAM Strike
The teams back in the day would take a .22 or 9mm pistol with a silencer and remove the automatic reloading parts so it would only reload manually (like when you pull back the slide to chamber the 1st round) to get rid of that noise. They used it for killing guard dogs around VC villages. They called it the "Hush Puppy".

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Those single shot guns were quiet. I once was able to attend a demonstration at CIA a million years ago. It was part of the OSS history display. They had exactly what you described: A modified High Standard (HDM).22. They fired it into a clearing barrel. Even in the secured hallway it was hard to hear. The bullet impacting the sand probably made more noise than the gun. I am still pouting that I could only watch from a distance.
They also had a Colt Woodsman but it was only for display. Could not even hold it.