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- "Hides the muzzle flash and reduces small burst recoil."
— In-game description
The Flash Hider is a weapon attachment featured in Tom Clancy's Rainbow Six Siege. It hides the muzzle flash of weapons so the enemy may take longer to notice where the shot come from. Every time the weapon starts firing, it slightly reduces the vertical recoil and greatly reduces the horizontal recoil for the first 3 shots. Internally, the Flash Hider reduces the first-shot recoil by 37.5%, the re-centering time by 30%, and random recoil (diamond) size by 5%. 
Re-centering time refers to the time between when a gun has kicked-up due to recoil and when it has returned to the point at which the player was aiming. Regardless of how far up the recoil has kicked the gun, be it one bullet or ten, this duration is fixed. Thus, the Flash Hider reduces this time by 30%.
The Recoil Diamond is the individual points of a recoil pattern when aiming down sight, reducing the randomization of bullet patterns during muzzle climb. The shape of the muzzle climb differs between guns, some being taller, others wider, therefore a reduction of the diamond makes the climb straighter and more predictable.
The Flash Hider is arguably the most versatile barrel for all range combat, assuming that the bullets hit the enemy in the first 3 shots.
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