The Real one: I have a AAC Flash hider that came on my ar-10 .308 that has a whole 5 rounds through it. I put a link below to show you what it looks like but it's not the one for sale. This one is threaded for 5/8x24 Right hand (common 30 cal thread). The outside of the flash hider is also threaded for easy suppressor attachment. http://www.midwayusa.com/product/77...read-hk-g36c-steel-matte?cm_vc=ProductFinding Price: 65 bucks shipped The Fake one: This is a old style Matrix/action Tank muzzle Brake. This is Only For "AIRSOFT" guns so if you put it on a real one and blow yourself up I don't want to hear about it. This is a threaded brake unlike the new clamp on ones this is the old style more like the real thing threads are 14x1 left hand pretty sure all airsoft guns use that thread.