Introduction of better armored tanks early in World War II, however, made the gun obsolete (as with other similarly performing weapons such as the German 3.7 cm Pak 36 and the United States 37 mm Gun M3).
Fremkomsten af bedre pansrede kampvogne i begyndelsen af 2. verdenskrig gjorde kanonen forældet (i lighed med andre tilsvarende, såsom den tyske 3,7 cm Pak 36 og den amerikanske 37 mm Gun M3).