The development came after prosecutors received new information in the case — that Baldwin's prop gun had been modified before being delivered to the low-budget western in October 2021, according to three people familiar with the matter who were not authorized to comment.

The replica of the vintage weapon — a Colt .45 revolver — had been fitted with a new trigger, increasing the odds that the gun might have misfired, as Baldwin has said, according to the sources.

More...

I knew, and said, there was something fishy about that ridiculous FBI report where the gun fired without the trigger being pulled and then the FBI said that, although that's the only time it fired in their tests, it would be impossible for the gun to fire without the trigger being pulled.