The only time a 20mm caliber firearm was used in the commission of a crime was once. It was in the late 50’s early 60’s, it was used in a poor attempt to breach as safe in Montreal. The article I read wasn’t very clear if they breached the safe with the Lahti or the oxyacetylene torch. It should be noted though the firearm was smuggled in from the USA. Otherwise I can’t find any other reference to either a 50cal or 20mm be used in any other crimes.




















































