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This rifle has a 20" Chrome Lined Cold Hammer Forged Barrel - Threaded 5/8x24 with a 1:12" Twist - Spikes One Piece Suppressor Mount . https://cdn.shopify.com/s/files/1/1450/8200/products/SBV1061-1_2048x2048.jpg?v=1488399605

Muzzle brake is part of the suppressor mount Spikes description of the suppressor mount "This is a one piece mount for our MRS/LRS line of suppressors. It combines the H.V.S. brake with the collar that slips over the barrel in one easy to install package. Just screw it on and your ready to go." link to the suppressor mount https://www.spikestactical.com/products/suppressor-parts-muzzle-devices-silencer-combo-mount

Yup what they said.