When? How about at the moment JFK was assassinated? Good grief. A rifle is seen in the 6th floor window at the moment of the assassination. Oswald's rifle is found on that floor. Cartridge cases from that rifle are found by that window. Bullet fragments from that rifle are found that were fired from that rifle to the "exclusion of all other weapons." It's a slam dunk.
Your complete failure to answer any of my questions is extremely telling! Could it possibly be that you are afraid to answer them, as it might result in the realisation that the narrative you believe is actually a house of cards build on a shaky foundation?
Tell us, "Richard", how could the MC rifle have been fired on 11/22/63 when the rust in the barrel, which should have been removed by the first shot, was still there when they found the rifle?
And tell us also, what bullet fragments were recovered from the limo by Frazier and his team?