Dead Air Silencers RXD Xeno BirdCage Flash Hider 9/16x24 Matte. They offer the superior flash suppression owners have come to expect with Ruger designs combined with the proven reliability of theDead Air Xeno mounting system. The Xeno taper mounting system ensures a secure lock-up and exceptional repeatability. The Xeno design ensures accuracy precision and dependable performance providing consistent and reliable performance every time even during hard firing conditions. The proven design of the Ruger Bird Cage flash hider ensures effective flash reduction resulting in enhanced focus on target. Available in multiple long configurations for rifles and short configurations for pistol caliber carbines. As always confirm that the bore size of your host firearm caliber (bullet diamater) does not exceed the bore size of both your muzzle device and suppressor. Package Contents: Dead Air Silencers RXD Xeno BirdCage Flash Hider Dead Air Silencers RXD690S: RXD Xeno BirdCage Flash Hider 9/16x24 Matte