A simple search of Weitzman's WC testimony confirms that he was talking about the rifle found on 11.22 when he referenced the Mauser in the FBI report:
Mr. BALL - I understand that. Now, in your statement to the Federal Bureau of Investigation, you gave a description of the rifle, how it looked.
Mr. WEITZMAN - I said it was a Mauser-type action, didn't I?
Mr. BALL - Mauser bolt action.