Que Industries makes an adjustable muzzlebrake, they were the ones who sold the Browing the boss system. I have put several on over the years. Best thing is, you dont have to thread the barrel. Just measure , I think, 1.5 inches back from the muzzle, and order the break accordingly. They have a collet type that just taps on with a a special steel ring, that you heat with a heat gun and a laser thermometer to keep tabs on the heat, to their specs, ring shrinks up and then screw the brake on. Usually cuts recoil by 30%. The brake has 100 total clicks of back and forth adjustment for harmonic dampening, IE finding the sweet spot. They retail for $185, takes 10 minutes to install. Will only go up to a heavy sporter weight barrel. YOu can find them on Brownells website, where I usually order from. Great service too, and thank you for your service.