Not just a rifle. It was the rifle.
(239) In the Lee Harvey Oswald backyard photographs identified as 133A Stovall,133A de Mohrenschildt, and CE-134, that same gouge is quite visible and can be measured and compared with the gouge on the questioned rifle . They are identical in every respect.
(240) Based upon this system of identification, the rifle in these photographs can be positively identified as the same rifle that is presently in the custody of the National Archives . Finally, it should be noted that although an FBI expert declined to make a positive identification of the rifle in question based upon this gouge mark, this expert did not have access to all of the same quality photographic prints that were available to the Panel. For example, the 133A de Mohrenschildt and 133A Stovall prints, both of which are of high quality, were obtained and reviewed by the committee in 1977 and 1978 respectively. This was the first time that these materials were analyzed . In addition, positive identification of the rifle was based upon an examination of CE-134, a very good enlargement (from the original negative) of CE-133A.* The FBI's expert in 1964, however, apparently did not consider this photograph in reaching his conclusion .
http://mcadams.posc.mu.edu/russ/infojfk/jfk6/assass.htm
Bull-pucky.
That conclusion is not supported by the actual testimony.
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.
Sgt. Kirk based his unique identification of the rifle in the photo on his view that tire tracks and moon craters are unique.