I bought this to go with my upgraded JG m4, looks good on the front, like a muzzle break on the front of many high end hunting rifles, and it does make that metal punching sound. Works kinda like an aftermarket car exhaust system would, just reverberating and "amplifying" the sound. If you want to make a loud gun even scarier, try this out...
I'd love to see this on an m249/m60. it would make any gun more intimidating.
no idea how to adjust the noise coming from it like it says you can, but it is pretty well set up stock.
You can loosen/tighten (its fully tightened stock) the front part that is in front of the little black ring on the picture, and even remove the amplifier part if you wished.
Finish is fantastic
Screws on to any 14mm Counterclockwise threaded barrel.
"Metal punching" noise does a good job describing what sound this makes.
I dont see any real way to adjust the noise.