All weapons in the game have penetration. For weapons with splash (energo and explosives) the penetration value is 1, which means that they will only hit one target, the first one they encounter. Other weapons can have penetration value higher than 1, they can hit multiple targets on their way, althouth with each hit the velocity (damage) will drop. There are a few ways to increase weapon penetration (like perk Penetrator and Piercing Projectiles weapon upgrade), which sometimes can have a great positive effect for weapons that initially had no penetration, for example many SMGs and shotguns.
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