The 
NUPROL Copperhead Flash Hider - BLACK
 is an airsoft accessory designed to amplify muzzle noise and is compatible with most airsoft rifles featuring a 14mm CCW thread. 
 
 
Product Details and Features
Function: This product acts as both a flash hider and a sound amplifier (sometimes called a "Soundhog" amplifier or "amp cone"), changing the sound of the airsoft gun's shot to a louder "crack".
Material: It is crafted from durable metal (aluminum alloy).
Compatibility: It features a standard 14mm Counter-Clockwise (CCW) thread, which fits most airsoft rifles.
Dimensions: The total length of the flash hider is 82mm.
Color: This specific version is black, but a tan model is also available.
Weight: The item weighs approximately 85g.