The gun that the BSA Experimental Model 1949 was supposed to replace was used extensively by British and Commonwealth forces throughout what two wars?
BSA experimental model 1949: The BSA Experimental Model 1949 was a submachine gun of British origin intended to replace the Sten submachine gun. Sten: The STEN (or Sten gun) was a family of British submachine guns chambered in 9×19mm and used extensively by British and Commonwealth forces throughout World War II and the Korean War.
World War II and the Korean War