Semi-automatic (single fire).
Unlocked at level 4.
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Full Metal Jacket bullets. Increases bullet penetration, thus allowing you to shoot through higher density cover.
Makes the weapon more silent and reduces recoil. This attachment lowers the weapons range and damage over distance.
Allows you to wield two weapons at once, one in each hand. You can't aim down on the iron sights, which reduces your accuracy.
Makes you hold your knife under your handgun. This allows you to melee twice as fast.
Increases the capacity of your weapons magazine, but it doesn't give you any extra ammunition.