The pistol is the primary weapon in Hacx. Compared to the Doom pistol, it shoots two bullets at once instead of one, and is a little faster. This makes it much more effective against monsters, but it also means the ammo is going to be wasted much more easily. The Pistol is one of two starting weapons, the other being the kick.
The pistol is quite useful to get rid of weaker monsters like thugs and buzzers by keeping them at a distance and making them enter the pain state, so that it is not possible for them to attack often.