I had to remove the Boomer Brake that came with my Ruger SFAR so I could put a can on the rifle. Selling the Boomer here. I am not sure if you can buy this thing separately on their website. It's 2-port brake they designed to tame a 16 inch muzzle, and it does a great job and is quite loud (plenty of videos online).

Threads 5/8"-24. It only has 140 rounds through it. Based on what Ruger sells other brakes for I am asking $50. Also includes a jam nut and some spare timing shims.