The marks on Robin's thumb are not gun residue

The marks on Robin's thumb are not gun residue

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There is no proof that the live round found on the floor of the lounge was a misfeed. It could have simply ejected from the rifle when the magazines were changed over. 
Also no fingerprints were found on either of the magazines which would lead one to believe that the person who changed them over could have been wearing gloves or else wiped them down.