The Flash Hider can be purchased for 6000 gold credits for any primary weapon. It greatly reduces the muzzle flash of the player's weapon, increasing the weapon's accuracy. This makes it especially useful for players who find a weapon's flash interfering with their shots or giving away their shooting position. It is especially useful on automatic weapons such as the the KT-44 and Shred-4, which both have a massive amount of muzzle flash.
The flash hider takes the appearance of a "birdcage"-style attachment on most weapons, but for the Intercept-L200 and KR600, it has an appearance closer to that of a muzzle brake.
The Flash Hider is the final muzzle attachment unlocked for all compatible weapons, excluding the Suppressor Mk X. It increases weapon damage by up to 10 points and has no statistical downsides, as well as fully eliminating a weapon's muzzle flash.