All of this has been argued to death, but here are a couple links.
Oswald owned the rifle:
http://jfk-archives.blogspot.com/2014/12/oswald-ordered-rifle.html
From that page---
Regardless of the fact that Oswald technically did order a 36-inch Italian carbine, per the words written in the February 1963 American Rifleman magazine ad that Oswald used to order the rifle (pictured below), Klein's Sporting Goods in Chicago shipped a 40-inch rifle with serial number C2766 on it to "A. Hidell" on March 20, 1963.
A company doesn't have what you ordered so they send something else instead? Not an acceptable explanation at all.
The company will send a statement advising you that what you ordered is not available but has an alternative stock if you wish.
Especially a firearm.
Also there is the still unexplained situation where Oswald [never to be separated from his supposed precious rifle] somehow ships it back from a New Orleans location with Ruth Paine ...not telling her or Marina about the concealed cargo...but yet it arrives voila' back in Irving-- covering itself up with a blanket, remaining snug until Lee [without even asking it's location] recovers it [un-noticed by all others] on a garage floor.
All that the nutters can come up with.. is maybe, perhaps, coulda, shoulda, woulda speculation and conjecture and none of it can hold even one drop of water.