It is effective against the common undead but it shouldnt be used to fight stronger zombies like the ravager or the brute. It has unlimited spare ammo but you have to reload.
Like all other weapons it can be upgraded at police stations or ammo crates. It has little recoil. In both games it is also used by soldiers if they cling to our hood.
This weapon is based on a Beretta M9 pistol. It can be also seen in undead police officers holsters,and also in SWAT Zombiess holsters and Riot Control zombies holsters and finally in undead soldiers holsters.