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AR 15 Gas blocks and Gas tubes come in all different types of materials and finishes from Black Nitride to Stainless Steel. Black Rifle Depot offers a variety of manufactures and depending on your custom build you may be interested in a upgraded Adjustable Gas Block from ODIN Works or APOC Armory. No matter what your choice Black Rifle Depot covers all AR 15 Gas Blacks and gas tubes with a lifetime warranty.