Man arrested for 2x4 labeled "High Powered Rifle"
The whole "what does tool mean" is a semantic side-issue. We all agree on the following:
(1) guns are inanimate objects with no mind of their own;
(2) there are situations in which their use is ethical;
(3) on the other hand, they can be used to kill innocent people.
Whether or not that falls within your definition of "tool," or whether you reserve that for wrenches and plyers, is irrelevant.
Anyway, getting away from that, I think there's an interesting oddity going on right now. Gun restriction advocates are pushing very hard against so-called military-style weapons, and on the other hand, gun control leaders are holding up shotguns as the epitome of legitimate firearms ownership, with VP Joe Biden saying in an interview "Get a shotgun. Get a shotgun" when asked about civilian self-defense and home defense.
Don't these people remember where pump-action shotguns came from? The Winchester 1897, designed by John Moses Browning, was used by US forces in the Philippine-American War, World War I, World War II, Korean War, and the Vietnam War. In WWI it was called a "trench broom" (the 1918 nickname equivalent of "street sweeper"), and the German military sought unsuccessfully to have its use banned as a war crime, and later threatened to execute any US soldier captured carrying one.
http://www.guns.com/2013/02/26/1897-winchester-trench-gun/
My Browning BPS is not all that different from this "trench broom" except for having a longer barrel (and many civilian shotguns have 20" barrels like the Winchester 1897). So when I'm hearing in one ear that "military-style guns" are bad but that "shotguns" are good, I really don't know what Biden is actually pushing for, and what policy reasons can support both positions simultaneously.
The Winchester 1897 in WWII: