Sometimes when you fire, the bullets don't actually come out of the barrel but somewhere off to the side.
http://xboxclips.com/DuBChiri2/43bc56b6-38d6-428c-9fb9-58c5d70bcccc
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It happened to me last night, but only after I stopped streaming did I notice it. Sorry I didn't get any frame data, but I can at least vouch for you now.