There is no one best gun, but the one with the largest explosion is the RPG if you are looking for something like that
The labor union's most powerful weapon is the strike.
the most powerful weapon is the lost katana it is +110
the most powerful weapon is the supernova lvl 99. that is the mega version of the harbinger
The weapon of the King of the Gods, Zeus, had to be the most powerful. Otherwise, he would be overthrown by the other gods. Thus, it was his thunderbolt that was the most frightening weapon.
One of the most powerful weapons used by the Comanche was the bow and arrow, specifically the Comanche war bow. It was a highly effective and versatile weapon that allowed for swift and accurate long-range attacks on horseback. The Comanche were skilled archers, making their bow and arrow a formidable tool in warfare.
a nuke
canyon
the cannons
A thermonuclear warhead
power and the government
Probably the ump45, its fast and comes with good amount of ammo, quick, decent attachments and can shoot down uavs with a breeze.
France is part of the "nuclear club" so we would assume that the most powerful weapon in France is some kind of Hydrogen bomb/warhead.