Ruger Hybrid Muzzle Brake. Locks into position using an easy-to-use external jam nut rather than shims. Port setup reduces noise and blast to the sides of the shooter. Specifications for Ruger Hybrid Muzzle Brake 90590R: Mfg Item Num: 90590R Type: ACCESSORIES - GUN ACCESSORIES - FLASH SUPPRESSORS/COMPENSATORS made in specialized factories: made in specialized factories Tactica: Tactical Master Model Header: Hybrid Muzzle Brake The Ruger Hybrid Muzzle Brake 90590R is a quality addition to the Ruger lineup. For more great deals on Muzzle Brakes & Compensators by Ruger please browse our Ruger Gun Parts page. Ruger Hybrid Muzzle Brake