JE Machine Tech AR-10 A2 Style .308 Birdcage Flash Hider w/ Crush Washer Black. Whether building a clone rifle or just looking for superior flash signature reduction you cant go wrong with this classic. Specifications for JE Machine Tech AR-10 A2 Style .308 Birdcage Flash Hider w/ Crush Washer: Manufacturer: JE Machine Tech Color: Black Fabric/Material: Steel Threads per Inch: 5/8x24 Length: 1.75 in Inner Diameter: 0.8 in Weight: 2.1 oz Features of JE Machine Tech AR-10 A2 Style .308 Birdcage Flash Hider w/ Crush Washer 5/8 - 24 thread for .30 Caliber only Phosphate finish Package Contents: JE Machine Tech AR-10 A2 Style .308 Birdcage Flash Hider w/ Crush Washer Crush Washer JE Machine Tech TS-FH3B: AR-10 A2 Style .308 Birdcage Flash Hider w/ Crush Washer Black