The Parker Gauss Rifle costs $8700. Although the weapon description might be slightly misleading, it's a excellent weapon. Although it does mediocre damage, it's pierces through multiple enemies, something that. Only this gun and the Longinus can do. If used correctly, it is a very reliable weapon, which can be used to kill a strong enemy, like a purifier,cand to kill other enemies, like shamblers and gasbombs. Unlike the Longinus, it does constant and reliable damage, and there is no penalty to the damage.