In addition to the Shanklin Memo I've already referred to (See "The Shanklin Memo") placing "the gun that apparently killed the President" (i.e., the SS AR-15) in the hands of the SS immediately after the assassination, there is another memo that confirms that "the rifle" was in the hands of the SS. "A. Rosen," presumably an FBI agent, wrote a letter to FBI Washington agent in charge Belmont that mentions that Secret Service agent Forest Sorrells (in charge of the Dallas field office) had "the rifle which allegedly had been used to assassinate the President." There is some confusion on Rosen's part, because the rifle in the hands of the SS had killed the President, but it was an accident, not an assassination. The assassination rifle, used by the TSBD shooter (i.e., the Oswald Mannlicher-Carcanno) was obtained by the Dallas Police Department, and remained in their hands until it was turned directly over to the FBI. So even though the "Sorrells" rifle had been involved in the assassination, it wasn't "used to assassinate the President" but was used to try to defend the President, and inadvertently discharged in an unintended slam fire accident. See the difference?
This memo is also important for another reason: it confirms the Paul Landis and/or reported Sam Kinney account of picking up one of the bullets from the car. I suspect that Landis and Kinney were referring to the same bullet, that first Landis found it and placed it on JFK's stretcher in Trauma Room One, where it was "removed" (per nurse Phyllis Hall) and then it was returned to the car, where Kinney subsequently found it, and put it on the hallway stretcher. Here is the memo, which I found the first page of on the Education Forum site, and the second page on the Mary Ferrell website (linked in the original post), with my. underlined annotations added:
Posted 12/5/2023, accessed 5/15/2025, at https://educationforum.ipbhost.com/topic/29948-re-paul-landis-112263-fbi-memo-confirms-for-schnapf/
Page 2 of the memo not on the Education Forum site, but found in the link to the Mary Ferrell website given in the original post, accessed 5/15/2025: https://www.maryferrell.org/showDoc.html?docId=62266#relPageId=143&search=Rifle