The Douglas submachine gun was a Canadian prototype submachine gun designed by Clifford Douglas.
The Douglas submachine gun was originally designed in the late 1960s. In 1973, a prototype was submitted to the Canadian Army for testing, but was rejected. Nothing more was done to develop the weapon.
The Douglas was an unusual bullpup design, feeding from a tubular helical magazine. It utilized a blowback mechanism in which the entire barrel and bolt recoiled at the same time. The movement of the barrel would open the breech and allow a new bullet to be chambered, whereupon it would be fired upon the bolt's return.
- The World's Machine Pistols and Submachine Guns Vol.II, Nelson & Musgrave, 1980