This AR-STONER Knurled Linear Muzzle Brake redirects sound and concussion away from the shooter and down range. This device is particularly useful for situations where blast needs to be directed downrange, away from the shooter and towards the target. The comp features 6 vent ports to aid in redirecting blast, along with knurled spiral lightening flutes. FeaturesOverall Length: 2.25 inOuter Diameter: 1.13 in.Net Weight: 5.7 oz.Material: Steel