It is a common Shooting-Type move. It does little to heavy damage, depending on what weapon the character is using. A very similar attack is Rapid Fire.
The attack is better if it's a low shoot rate weapon, like a shotgun or a pistol. It fires one bullet at a time. It's power increases if the character is a Sharpshooter, a Gunner or a Hunter. This attack often comes with Reload, Blast and Rapid Fire. Stating that it is a Shooting-Type move, Fiends never use it.
It does 10 - 70 damage, depending what weapon or who is using it. Rapid Fire is 3x this damage.
The attack might cause the foe to lose balance and fall, giving more time to attack. Though the chance for this to happen is less than Rapid Fire.