I have several. All but one of them are safe to fire (the one from Pakistan is unsafe to shoot) and I shoot most of them regularly, except for the Steyr because the only ammo I have for it is from the 30’s and is Nazi marked, making it too rare and valuable to fire.
Mosin Nagant M44 (Soviet Union, 1945, $99)
SMLE No1 Mk III (Britain/India 1915/1951, $300)
Steyr M95 (Austria-Hungary 1895–1944, $200)
SMLE No5 Mk I (Pakistan, date unknown, $300)
I plan on buying a German Mauser 98k and a German Mauser C96 pistol soon to add to my collection, and I intend to fire both of them as well. Many WWI and WWII weapons are relatively inexpensive, ammo is available, and alot of them are safe to fire. Go to this site for more information.
also, in before the “gunssss are sscarrry and evvvillll” crowd