The Spike's R2 Muzzle Brake features extremely large side ports designed to divert gas and reduce felt recoil for .308 Winchester rifles. Constructed from 416 stainless steel with a durable Melonite finish for superior performance and longevity.Spike's R2 Muzzle Brake for .308 Winchester416 stainless steel construction5/8x24 thread pitchLarge side porting for maximum recoil reductionMelonite finish for durability and corrosion resistanceIdeal for precision shooters and enthusiasts looking to tame recoil and improve follow-up shot accuracy with their .308 Winchester rifle platform.