The Fortis RED (Rapid Engagement Device) muzzle brake delivers military-grade performance with 303 stainless steel construction and 5/8X24 threading for 7.62MM caliber firearms.Fortis RED Rapid Engagement Device Muzzle Brake303 stainless steel construction for durability5/8X24 thread pattern for secure installationIncludes crush washer for proper timingControl shield compatible designTested by military law enforcement and 3-gun professionalsProven performance under full auto conditionsMade in the USAEngineered for competitive shooters military and law enforcement professionals who demand superior muzzle control and accuracy. Enhance your shooting performance and keep more rounds on target with this battle-tested muzzle brake.