The Sons of Liberty Gun Works Liberty Gas Block features a .750" diameter design crafted from 4140 heat treated steel with a durable nitride finish.SOLGW Liberty Gas Block - .750" diameterMade of 4140 heat treated steel constructionNitride finish for enhanced durabilityIncludes knurled set screws for secure installationReady to be pinned for permanent mountingDesigned to sit properly on the gas journal shoulderPerfect for mil-spec AR-15 builds competitions or tactical applications where reliable gas system performance is essential.