"3 experienced LE officers in the room." Experienced with what, exactly? More precisely, exactly what expertise do you think they had in precisely identifying weapons?
Walt posted that a 6 year old could identify the Carcano in the grainy Alyea film by comparing it to a picture of one on the internet.
I simply pointed out that there were 3 experienced LE officers in the room, with a much better view of the rifle than Walt's 6 year old, who identified the rifle as a Mauser.
As far as experience, nothing in particular as far as weapons identification other than training/experience in evidence collection and greater familiarity of firearms than the general public.
Thank you for bringing up the subject again and giving me a chance to reiterate my point.