de lisle carbine

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Wikipedia:

The De Lisle carbine or De Lisle Commando carbine was a British Carbine used during World War 2. The primary feature of the De Lisle was its very effective suppressor. That, combined with its use of subsonic bullets, made it extremely quiet in action, possibly one of the quietest firearms ever made.

Few were made as their use was limited to special military units.

This is the De Lisle Commando Carbine - not well known but still played its part in military history. It was in service from 1943 to 1965 and it used .45 calibre ammunition. The british commandos used it in WW2 for one primary reason - the De Lisle Carbine was extremely quiet, making it useful for stealth missions at the time. It is often recalled as one of the quietest guns ever made.

There’s an old story of the De Lisle carbine which I find funny. The story goes that early 9mm De Lisle prototypes were horrifically inaccurate, and that one rainy day De Lisle held an exhibition to show off his new rifle. On the range he had a variety of targets arranged. On his first shot, however, the round, due to the prototype’s inaccuracy, missed the target, but struck the head of a chicken crossing the range. The crowd thought that the chicken had been De Lisle’s intended target and applauded him.