CMC Triggers AR-15 A2 Flash Hider Thread Pitch Black Small. It's the classic birdcage that's been on service rifles for decades and it earns its spot by knocking down muzzle flash without much fuss. This one is machined from steel and cut with 1/2x28 threads which is the standard pitch for .22 caliber and 5.56 barrels. The A2 mount pattern means it also works as a base for suppressors and other devices built around that interface. Simple proven and priced so you can put one on every build. Specifications for CMC Triggers AR-15 A2 Flash Hider: Manufacturer: CMC Triggers Color: Black Gun Make: AR Platform Gun Model: AR-15 Package Contents: CMC Triggers AR-15 A2 Flash Hider What firearm models does the manufacturer say CMC Triggers AR-15 A2 Flash Hider is compatible with? The manufacturer suggests that CMC Triggers AR-15 A2 Flash Hider is compatible with AR-15CMC Triggers CMC-MD-A2-1228: AR-15 A2 Flash Hider 1/2x28 Thread Pitch Black Small