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I haven't found anything in the rules that says the text description of an ability isn't part of the rules for that ability. To me, the word punch means fists and those few weapons that are used to enhance fists, like cestus and spiked gauntlet.
"Punch" is not a weapon. It is actually not a game term, to my knowledge it has never been formally defined in rules text. Unarmed Strike is a weapon which could include a kick thus not requiring your hands to even be free when delivering an unarmed "punch" with Pummeling Strike. Cestus, spiked gauntlet, and the others suggested by several posters are all defined weapons. The text for this feat does not mention any specific weapon or set of weapons (e.g., close weapon group) as defined in game terms. The clause "in a single punch" could be replaced with "in a single burst" and have the same meaning to many of those reading the text. If the author intended this to be limited to a specific set of weapons, many of us expect them to list the restrictive set of weapons.
No-one here can claim the author did or did not intend for the feat to be restricted to certain weapons, and this is because the text of the feat does not clearly spell out this intent. Thus, we are asking for clarification.