I have always told my students (and my own children) that intention determines the term. For example, some years ago in, I believe, Alabama, a man seriously beat on a victim with a banjo - yup, assault with a deadly weapon. Another example, a man attacked his wife with a frozen squirrel. It broke during the attack so he went to the freezer, grabbed another one and continued with the attack. He was charged with assault with a deadly weapon. (At the time I read this story I realized that I had several 20+ pound salmon in my freezer - I hoped the authorities were not about to start sarching freezers for deadly weapons!

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The intentions of the users put the squirrels and the banjo into the category of weapon, but my intention with the salmon would not .
On the other side of the coin, without any intention on the part of the user, some things have been declared 'weapons' by the powers-that-be. In the 1700's the English crown declared bagpipes as weapons. Any Scot found in posession of same was subject to execution. And to this day, some people still consider the use of bagpipes an assault. (I am not one of them by the way

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So, as do many others, I have firearms. One or more of them may or may not be used as weapons. It will depend on the circumstances at the moment of use. If circumstances demand, I will (like kennyd's wife) use a skillet, a hammer, a hockey stick, etc... whatever is necessary, including a firearm.
Cheers
Kerry