Man your own jackhammer. – Listed damage is based on the character's melee damage, evenly distributed among the 7 pellets.
Usage & Description
The Face-puncher's damage output is increased by melee bonuses from all sources, so it can be very powerful with melee builds with a lot of such bonuses; but it also benefits from some (but not all) gun damage bonuses for even higher damage potential.
As the Face-puncher deals melee damage, it cannot score a critical hit.
At level 50, the character's base melee damage is 1338, so each of the Face-puncher's pellets does 1338/7 = 191 damage. However, this value is already increased by the +60% melee damage blade the Face-puncher comes with, for an effective 306×7 without any other bonuses.
The Face-puncher may come with a critical damage bonus, however this has no effect because it cannot do critical hits.