The Outlier RiZero Timed Muzzle Brake was designed by PRS shooters for PRS Shooters. Constructed from durable 416R Stainless Steel, the RiZero was built to withstand demands of long sessions. FeaturesEngineered to make the most of gas dynamicsThe 1/2x28 thread pitch is for gas guns only30 Degree vertical baffle that reduces muzzle rise by an impressive 90%Self-timing feature with bolt prevents unwanted unscrewing and maintains peak performance