The supposed murder weapon of President Kennedy, the Mannlicher-Carcano rifle found on the 6th floor of the Texas School Book Depository 11-22-63, moments after President Kennedy was shot.  This rifle was noted for it ineptness on the battle field and also its danger in that the firing pin could explode in the face of the shooter.  It was referred to by some as the Humane Rifle because of its inability to rack up enemy dead counts.  Oswald could have bought a less expensive and BETTER rifle practically anywhere in Dallas without leaving a paper trail.  The FBI actually had to re-adjust the scope before they test-fired it!