Infinite Product Solutions QD Knurled Sound Redirect Sleeve Matte Black Anodize Knurled. 5 Inch Sound Redirect Sleeve. Engineered to direct sound away from the shooter this compact and lightweight sleeve enhances your shooting experience by reducing perceived noise and concussion. Perfect for tactical scenarios range sessions Available in a gripable knurled outer texture. Sized to add 2.5 Inches when combined with Infinite brand QD muzzle brakes or flash hiders. Specifications for Infinite Product Solutions QD Knurled Sound Redirect Sleeve: Manufacturer: Infinite Product Solutions Length: 2.29 in Weight: 1.136 oz Finish: Matte Black Anodized Color: Black Last Chance: Yes Height: 1.24 in Width: 1.24 in Fabric/Material: 6061-T6 Aluminum Features of Infinite Product Solutions QD Knurled Sound Redirect Sleeve Ultra lightweight adding virtually no weight to your barrel Attaches to Gen 1 Gen 2 and Gen 3 QD Infinite Muzzle Brakes and Flash Hiders Easy to install Non-NFA no need to file a tax stamp or register with the ATF Does not reduce sound but redirects it Spotlights your sound out front away from the shooter Quieter behind the gun to the sides of the gun and to the sides of your target but NOT for the target itself Package Contents: Infinite Product Solutions QD Knurled Sound Redirect Sleeve Infinite Product Solutions SRS-25IN-BA-K: QD Knurled Sound Redirect Sleeve Matte Black Anodize Knurled