We are told that Lee disassembled the carcano and placed it in a paper bag to conceal it when he transported it to the TSBD....
Logically that doesn't make any sense.... The act of disassembling a model 91/38 short rifle reduces the length of the rifle by a mere 5 1/4 inches. So why bother 
And the disassembled rifle pieces are awkward to handle and reassemble....
There's not an iota of doubt in my mind that if Lee had disassembled that rifle then his finger prints would have been all over the various pieces of the rifle....but the investigators never found a single identifiable print on that gun. ( I doubt that he had the mechanical ability to figger out how to disassemble the rifle)
And what's even more difficult to believe is the idea that any assassin would set out with only three rounds of ammo ....What an absurd idea!!
Well you're wrong because Oswald's rifle would have had four rounds of ammo and the fact that Oswald loaded his last four bullets into the rifle proves that that Oswald's actions were last minute and not planned, whereas if Oswald was being set up then as you explain, the conspirators would have loaded the planted rifle to it's perceived maximum, so thanks for your observation in proving Oswald's guilt! 
Dear reader...I don't agree with Walt on everything but his reflection above is spot on and John Mytton is off...just simply off.
Mr Mytton even disagrees with his own Warren Report conclusion that Oswald DID plan the assassination and it would be obvious that such a cold-blooded killer would have taken all the ammo and firepower at his disposal.
loaded his last four bullets
And that proves Oswald did it!
A preconceived notion= an opinion formed beforehand without adequate evidence
If you don't have any solid verification of something...just invent some.
