BARE FISTS

The Bare Fists are quite literally just that. Your hands. It's unlocked at the start of the game, and deals 50 damage with unlimited ammo. It is a short ranged melee with rapid attack speed.

Tactical Analysis
...why?

Well, the Bare Fists can be used with the Bloody Knuckles mod to further augment your punching, and they are surprisingly effective in close quarters. They also have no overheat, so they can be used to, theoretically, take on a whole group at once.

...Somehow some fisticuffs can attack enemies wearing power armour. ¯\_(ツ)_/¯