I had this theory Oswald may have removed his rifle from the Paines garage in Oct/63 , hence the note written by Mrs Paine on her calendar about a rifle in the Oct block.(She claims “mistake” but you gotta wonder)
Problem with my theory is why the conspirators after successfully getting Oswald away from his boarding house for 18 hrs, ( fake message on Thursday afternoon about Marina wishing to reconcile)and able to steal his rifle possibly, did not take time to test fire the rifle, nor check out the scope and zero the rifle at range of 100 yds. in the 18 hour period of time the rifle is in their possession?