I will go first, a stealth tank

Its only stealthy at night (they just painted it black)

A rifle scope that can see through walls.

A weapon system that spreads peace, love, and freedom indiscriminately.

An army of hive-mind cats.

An APC that only needs the power of the sun to run; no fuels.

A sword that appears in your hand whenever you need it, and then disappears again when you don't.

It’s a plug in hybrid and silent like a Prius under 5mph.

A button that makes the backdoor in enemy C&C softwere.

it's AI controlled

A gauntlet that lets you control metal like magneto.

Too stealthy. Crews can't find it.

Dima, Ivan, I need weapon from you that only hurts bad guys!

A gun that switched everyone's gender but not their sex.

It can pierce through any armor.

Robotic Christopher Walken.

a hydrogen powered artillery cannon with 2 kamikazi drones equipped

Stealth tank skin requires full stripping and recoating after anything hits it to remain stealthy.

An anti radiation missile that targets passive systems

My dick, but it's armored.

A Knife which looks like a Gun but is also A Gun which looks like a Knife.

They make: open wagons, flat wagons, tank cars and tanks.

Quantum Tunneling Neutron Cluster Railgun capable of assassinating a target from the opposite side of the earth at slightly less than the speed of light.