You're joking, right?
Serial numbers can be scratched off of weapons ...odd that it wasn't if it was destined to be a murder weapon -starting with the alleged Walker shooting-- Same with pistols. Oh, that's against the law? Give me a break and don't mention that.
Either Oswald left a hundred and umpteen points of 'evidence' behind to play 'catch me if you can' or he got set up.
Well, he got set up.