Re: Can a gun fire with out pulling the trigger?
Yes. But in a modern firearm, that would mean something is wrong with the gun mechanically. By modern I mean one made in the modern day. Modern recreations of late 1800’s revolvers have several more safety features than the originals did. One would assume that is what they would be using on set, not an actual antique. Uberti and Rossi are probably the most two popular brands, and are made in Italy and Brazil respectively, though Ruger still makes single action revolvers.
Now I recall an earlier article that said one of the guns went off unexpectedly once or twice previous, so it is possible something was direly wrong, but that should have been sorted out by the armorer if so.
Old revolvers like this are called single action revolvers. These are unlike the average revolver from the 20th century onward, which would have a double action trigger (can cock and fire with the pull of the trigger) and the cylinder swings out for loading. Instead, the cylinder has a gate and each bullet has to be loaded one at a time and removed one at a time. The hammer in the back has to be manually cocked for each shot. If the hammer is down, pulling the trigger does nothing. The hammer has to be cocked and then the gun will fire when the trigger s pulled.
There is an optional “half cock” setting on most single action revolvers. This, as the name suggests, has the hammer only cocked part of the way. In this position the triggers still does nothing, and has to be manually cocked fully to fire. However, it is possible with a bad knock or if the sear is bad, for the hammer to fall from this position. Though again, with modern firearms it shouldn’t fire from that position. (This is where the term “going off half cocked” comes from.)
The reason for the half cocked position was originally safety. The old revolvers have the firing pin on the hammer. With the hammer down, the pin would be resting on the primer of the bullet in the chamber. If the hammer is hit hard enough, it could go off. This could have happened from dropping the gun, or having it hit while riding, or any other hard jostle. Many people would carry one chamber empty, leaving the pin to rest on nothing, preventing an accidental discharge. The Half Cock setting was made to keep the pin off of the primer and was, at the time, considered safer. But like I said, it could still slip or otherwise go off accidentally. (Some revolvers allowed the cylinder move so the pin would rest in a notch BETWEEN bullets.)
Modern versions of these revolvers have a transfer bar and an internal firing pin. Instead of the firing pin being on the hammer, it is internal, behind the bullet. There is a physical bar that sits between the hammer and the pin, preventing the hammer striking the firing pin unless the hammer is cocked back and the triggers is pulled. One would assume that the gun used would have one of these, as it has been around since the 60s or 70s.
So how could it fire if Alec Baldwin said he didn’t pull the trigger? If it was cocked or half cocked, it is conceivable that it hit something or the sear slipped and it fired. But also the transfer bar would have had to been faulty.
It is just as likely he is wrong and he did pull the trigger, even if he didn’t mean too. This happens probably 99% of the time when someone claims the gun “just went off”. (Yeah, because you pulled the trigger.) This would be even more likely if he was doing other actions at the same time. Especially grabbing something with his left hand, as you will unconsciously tighten your grip with one hand if the other hand is tightening.
It seems to me if it truly went off with out the trigger being pulled, they should be able to recreate it during the investigation. And then the bigger question - how and why did a live round get on set. (Which I heard on the news that someone had brought live ammo for actor training. Which never should have been allowed, period.)
Baldwin may not be culpable for the gun firing when it did, but as a producer it sounds like he has some culpability for how lax the safety was.