I bought this for an AR variant rifle threaded in 5/8x24 because I wanted to eliminate my muzzle flash when hunting hogs at night. It wasn't long before I just went ahead and bought a suppressor. It really does do a great job at eliminating flash, even better than the standard A2 flash hider. It also really looks good on the rifle.
I bought it from Brownell's for $45. I am asking $30. I am located in the North Houston/Spring area but I can ship this pretty much anywhere provided I get a check first.
Crush washer included.