Yep, the HSCA expert proved beyond all doubt that Oswald's rifle(C2766) that was directly linked to the fragments discovered in JFK's limo and found on the 6th floor of the Depository where Oswald worked, was being held by Oswald in the backyard of Oswald's apartment on Neely Street!

Mr. FITHIAN . Then I take it, it is your testimony that the chip or the defect is sufficiently unique, with the corners or whatever, that spotting it in each of the pictures at least gives you the confidence that that rifle you are holding is the rifle that was photographed?
Sergeant KIRK. When I match that up with the scientific data Mr. McCamy has obtained from measuring it, this has to tilt the scales in the direction, yes, indeed it is the same rifle .
That is not "proved beyond all doubt". It's not even beyond a reasonable doubt.
Also consider that Oswald lied to the Dallas Police that he lived on Neely Street, Hmmm I wonder why?
You don't know what Oswald said.
Another interesting factoid is that the backyard photos were taken shortly after Kleins sent C2766
You don't know if or when C2766 was "sent".
and just before Oswald used C2766 in an attempt to assassinate General Walker.
LOL.