Introducing the Geissele Automatics Super Gas Block Nitride – .750″! This precision machined gas block is perfect for your next AR-15 or AR-308 build. Crafted from 17-4 Precipitation Hardened stainless steel, the SGB Nitride is a lightweight and low profile gas block that will give your rifle a sleek look. It mounts securely with twin set screws, and can also be pinned for extra security. The SGB Nitride is finished with a durable salt bath nitride finish, and fits barrels with .750″ diameter gas seats. Give your rifle the gas block it deserves with the Geissele Automatics Super Gas Block Nitride – .750″!