Actually, the consensus was for you to sell your current gun(as a whole) and buy a brand new one that fits your needs. And when you speak of a muzzle brake, are you looking at actually a flash hider? From the little I've read and from my own limited experience thus far, a muzzle brake isn't all that necessary since there is little muzzle rise when the gun is fired in semi-auto mode.

Hope you find what you need and have fun!

Hobie