Adjacent to Marie Curtis Park West is the former site of the Small Arms Limited factory. The Ordnance Branch of the Department of National Defense authorized the construction of the factory in 1940. After transfer to the Department of Munitions and Supply, a Crown Corporation, Small Arms Ltd. was formed to operate the facility. By June 1941, the first five rifles had been produced. Huge quantities of British-pattern military small arms were manufactured there during the Second World War, including such weapons as the Bren light machine-gun, the Sten submachine-gun or machine-carbine, and the Short-magazine Lee-Enfield bolt-action rifle.
Small Arms Ltd. ceased operations at the end of December 1945. Beginning January 1, 1946, operations continued as the Small Arms Division, Canadian Arsenals Limited. The factory was closed June 30, 1976.
There are plans to incorporate the former grounds into the Marie Curtis Park West park extension. It must be noted that Marie Curtis Park West is located in Toronto, while the 'Arsenal Lands' are in Mississauga, Peel Region.