So the vertically vented gasses have the effect of forcing the muzzle back down, keeping it on target. As we remember from physics, every action has an equal but opposite reaction. In order to counter that muzzle rise effect, a compensator vents some of the gasses that escape from the barrel vertically. The body mechanics involved in firing a gun means that there’s a good bit of “muzzle flip” when the gun goes bang, an effect where the recoil of the gun is translated into the muzzle climbing vertically. Want flash suppression data on different devices? Check out Jeremy’s first flash hider roundup here, and the second one here.Ī compensator or “comp” is a muzzle device designed to counter the vertical rise of the barrel when the gun is fired. The standard A2 birdcage flash hider that’s used on most AR-15 rifles is also pretty efficient, but the real reason why it’s used is that it’s a combination flash hider and compensator. Whether manufactured by Knights Armament, Strike Industries, Surefire, Vortex or AAC, they all make that visible flash disappear pretty efficiently. There are different kinds of flash hiders, and the most efficient are those with three prongs. But you can see that it works by comparing a gun with a flash hider with one that only has a bare muzzle. To understand exactly how it does that requires a mixture of fluid dynamics and chemistry, a background that I lack. Nick Leghorn for TTAGĪ flash hider works by efficiently mixing the air and the unburnt powder at the end of the muzzle in such a way that there is little or no flash. Even for civilian shooters, that flash signature has a tendency to obscure the sights, ruin low light or night vision, and make follow-up shots difficult. That unburnt powder combusts as soon as it clears the end of the barrel, which results in a large fireball that is very visible, especially on the battlefield. Since the 5.56 NATO cartridge was designed to completely burn its powder in a 20-inch barrel, that leaves four missing inches worth of unburnt powder being left over after the projectile is long gone. However, most popular AR-pattern rifles are sold with 16-inch barrel lengths. When a gun fires ammo - especially a carbine like the AR-15 - most of the powder is burned inside the barrel and used to propel the bullet downrange. The idea behind a flash hider (or flash suppressor) is pretty simple to understand. military, and since the current service rifle is the model for a lot of civilian firearms, it’s what the gun companies tend to use by default as well. It’s the standard-issue muzzle device for the M16 and M-4 rifles in the U.S. When you buy an AR-15, or any modern rifle with a threaded barrel, the default muzzle device is typically a flash hider.
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