Just to clarify, as per my post above, this additional "mallet" testing was only carried out AFTER the weapon had already been tested by an FBI firearms expert first, including trying to make the gun fire without the trigger being pulled for 12 individual shots, and the expert was unable to make it go off accidentally in normal use with only a trigger pull being able to fire the gun. Then, after being unable to make the gun fire accidentally in normal use, the expert moved on to percussive testing (giving it the best chance of accidentally firing) and so hit it with a mallet repeatedly and it still wouldn't go off without the trigger being pulled whilst being hit and then, even after after hitting it so much the firing mechanism broke in 2 places, making it even more likely to fail and set the gun off, the gun still wouldn't fire without the trigger being pulled.
That is the reason they didn't record the details of the internals, because they couldn't make the internals fail in anyway, even after being broken, however I'd suggest thats still poor evidence collection myself.
By this point occam's razor is pointing very, very heavily into suggesting that Baldwin did actually pull the trigger and it didn't "just go off" but without a court case to hear all the evidence, it's meaningless in the end, except to tjhose killed and injured (2 people were hit) and their families etc.