I had a chance to spend a couple days filming at Movie Armaments Group up in Toronto, and took a minute to speak with Charlie Taylor, their Managing Director. MAG is has been around for 25 years supplying guns to the film and TV industry, and Charlie has immense experience working with blank-fire guns. Sounds easy, right? Well, there's really a lot more that goes into reliable and safe blank-fire conversions than you might expect...
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This video is a couple years old so it has nothing at all to do with the Alec Baldwin fiasco.
It does beg the question, though - why were they using functioning firearms on that particular movie set when other options were available?