This is a Odin Works Gas Block known as the Gas Block, model GB-75.
This low profile gas block is manufactured to ensure the proper function of the gas system. It is engineered to fit inside all ODIN Works free float forends.
Features:
Fits inside all ODIN Works Forends
Fits .750 diameter barrels;Weight: 1.95 oz (includes screws and pin);Made from Carbon Steel;Nitride finish;Includes cross pin and set screws