User blog comment:Subject 12/Assassinews 04/07 -- Assassin's Creed III at PAX East/@comment-1404296-20120407170546/@comment-4829046-20120408060405

In those times carrying guns was allowed so he can use guns just not all of them. Maybe just a certain type of gun is allowed. I think the hidden gun might be used for sneak attacks where he infiltrates the enemies seemingly unarmed then BAM!