Harry accompanied Arthur Weasley into the vaults of the Department of Misuse of Muggle Artifacts, Harry under the Invisibility Cloak to avoid being seen by hostile Ministry officials. The vault showed shelves after shelves of what seemed the biggest variety store in the Muggle World. Which might be placed in Sarajevo, looking at the shelf Arthur in front of which Arthur stopped.
Arthur handled a rather heavy and ominous looking black, T-shaped artifact.
-This, Harry, is called an Uzi sub-machine gun. You pull on this thingy here called trigger, and it spits metal pellets out of this hole over here. Remember to point the hole at what you want, er, stopped.
Harry raises the Uzi in his hands in awe. It's surprisingly heavy.
-No wand involved, then?
-No wand involved
Eventually, Harry finds himself under the Invisibility Cloak in the middle of a Death Eater including Voldemort meeting. He turns around while shooting his Uzi, ending up surrounded by bullet-ridden bodies. Voldemort gets 23.
But his invisibility cloak is ruined. Ginny picks it up, and mends its scars with (Invisible) thread and needle. All is well.