@Angelkiller2 On March 12, 1963, Oswald (under the assumed name Alek Hidell) ordered the rifle with an attached telescopic sight from a February advertisement in American Rifleman for a "6.5 Italian Carbine" (model not given in the advertisement). The rifle was ordered from Klein's Sporting Goods located in Chicago, with Oswald paying $19.95 plus postage and handling, by money order. This amount included money for the rifle ($12.95), plus a new 4x telescopic sight that was to be custom mounted to it as part of the package. The rifle was also shipped to him at the Hidell post office box, also (by coincidence) on March 20, the same day as the pistol. He also picked up the rifle on March 25.
Klein's sporting goods had initially shipped surplus Carcano model M91 TS rifles under their "Italian carbine" ad, and this is the model shown in the ad from which Oswald ordered the rifle. However, effective April 13, 1962, Crescent Firearms, the wholesale supplier of Italian rifles to Klein's, had been unable to supply Carcano TS carbines, and had switched to surplus Carcano M91/38's.
Wikipedia: John F. Kennedy assassination rifle