Tiger Rock 3 Port Flash Hider AR-15 1/2x28 Thread Pitch Black Small. This is done by eliminating the downward facing ports. Specifications for Tiger Rock AR-15 3 Port Flash Hider: Manufacturer: Tiger Rock Color: Black Fabric/Material: Steel Threads per Inch: 1/2x36 Gun Make: AR Platform Gun Model: AR-15 Length: 2.5 in Weight: 3.56 oz Package Contents: Tiger Rock AR-15 3 Port Flash Hider Wrench Flats What firearm models does the manufacturer say Tiger Rock AR-15 3 Port Flash Hider is compatible with? The manufacturer says that Tiger Rock AR-15 3 Port Flash Hider is compatible with AR-15Tiger Rock MBRM2: 3 Port Flash Hider AR-15 1/2x28 Thread Pitch Black Small