No one has given an inkling as to the "owner" of the gun. I bet it's Baldwin's.
Apparently not.
Alec was filming a scene on the set of his new Western movie, Rust, that required him to fire a gun that was supposed to be loaded with blanks.
But, the gun discharged either shrapnel or a bullet, which hit two people on set including the director of photography, Halyna Hutchins.
It that's true, his blame game isn't gonna convince anyone.