The De Lisle Carbine is an integrally suppressed .45 caliber bolt action carbine developed for British commandos during WWII. It is widely considered to be the quietest small arms weapon of it’s time.
There were only around 130 carbines made during the war by Sterling Arms between 1942 and 1945.
It was a combination of a No. 1 Mk3 Lee Enfield (action and stock), a Colt 1911 magazine and modified well, and a 1 foot long baffle section attached to the end of an 8 inch barrel.
See it in action and learn more about the De Lisle Carbine in the awesome video below.