I have an idea to build a small diorama including a figur of Canadian Expeditionary Force WW1, but have problems finding one to use.
Anyone have an idea, what could be used/converted

Per

ICM's British/commonwealth weapon sets include Ross Rifles, which would be a must unless you want to make your figures late war. Ross rifles were also popular among snipers, so that would also be worth taking into consideration. M1911s and American revolvers seem to have been favoured over Webleys, wealthier officers would purchase their own sidearms.