No, it's not for sale. It's one I built for a customer.
Pyscodog, thank you for the thumbs up!
I have put muzzle brakes on several hundred 44 magnum revolvers, and at no time have I ever noticed a noise increase with the use of a muzzle brake. The 44 magnum is the only caliber I can say this about, and I have never been able to figure out why.