Oh, fer cryin' out loud. You too? He was telling Sayers what he saw, not giving him a lesson on Mauser design.
Oh, fer cryin' out loud. You too? I'm not sure what that's supposed to mean..... I don't know who else is using commonsense.....But It obvious to me that Weitznan was familiar with the 7.65 mauser.... Afterall he caught a glimpse of the magazine on the carcano and assumed that the carcano was a mauser.
And when he was given a mauser to examine and describe LATER that afternoon at the police department he started by reciting what he knew about the mauser....Thus Sayer wrote....
"Mr Weitzman described the rifle which was found as a 7.65 caliber mauser, bolt action rifle, which loads from a five shot clip which is located on the underside of the receiver forward of the trigger guard."Why can't you see this John?