HA HA HA.
that rifle was used to commit the crime.Well, By Golly For once you are right.... But it was not the crime of the murder of JFK....It was the crime of framing an innocent patsy by the authorities.
Unfortunately for them, ( and fortunately for us) Tom Alyea's camera captured the scene of the rifle lying on it's left side on the floor. The preceding scene from Alyea's film shows DPD detective Studebaker perched atop boxes of books just after he finished taking the in situ photo of the carcano. Since the next scene on Alyea's film shows the rifle lying on it's left side with the leather sling up as Detective Day reaches out to pick up the rifle we can be absolutely certain that the in situ photo that detective Studebaker had taken showed the rifle lying on it's left side.

What's the point you ask..... The official DPD in Situ Photo depicts an entirely different scene..... The official government approved in situ phot shows the rifle in a location that is closer to the stairs and the rifle is NOT lying on it's side. And Furthermore....Tom Alyea said that it was obvious that the hiding place had been prepared BEFORE the shooting.