I thought they had ended use after the Brandon Lee tragedy. Unfortunately, I was wrong. I can't even wrap my brain around the logic of using real guns on a set. Modifying real guns to be 'non-lethal' when a good prop dept can fabricate a realistic-looking facsimile is downright dumb and dangerous.
@AgentCarter_SSR I'm hearing now that the production was already having issues. That same 'prop' gun was having a misfire issue earlier, and the film crew were complaining about conditions on the set, and non-union workers were brought in to fill in for them.
The misfires alone should have been a HUGE red flag.
The crew complaints about unsafe working conditions is another.
They should have replaced the gun and addressed the crew concerns. Instead, they replaced the crew & kept the gun.