Gun shop or sporting good store
Could be anything. You could be thinking of an armoury, arms room... most people I know simply store guns in a closet in their home, though.
It's typically called an armory.That is the Arms Room or Armory.
The trash goes into a cycle (home -> plant -> store, ext) and it keeps doing it.
You can get water guns at your local store. Such as walmart or target.
A gun store
They purchase them at a gun store.
One who keeps store.
The guns used in war to shoot down planes are called antiaircraft guns.
Machine guns.
The Dollar Store, Walmart, Walgreens, and Target usually have them. :)
in a case
inside a locked gun cabinet