It is official. The revolver fired by Baldwin that killed Halyna Hutchins and wounded Joel Souza is a F.lli Pietta 45 Long Colt Revolver.
Take a look at the video of how it operates:
It is a single action revolver. That means you have to cock it manually in order to fire it each time. There is no way to fire it accidentally. You have to cock the hammer and then put your finger on the trigger. (The gun, if loaded, can be fired if you hit the hammer with a club of some sort, but that also is a purposeful act.) If you pick it up and the hammer is de-cocked it will not fire.
Also look carefully at how it is loaded. You have to cock the hammer halfway back and open the loading gate. The cylinder stays in place. You must rotate it to insert a round into each of the chambers.