The Odin Works AR-15 adjustable lo profile gas block is made from high quality carbon steel and features a matte black finish. The adjustable valve features 20 adjustments allowing you to tune your firearm with various ammo loads and with or without the use of a suppressor. Please make sure you purchase the correct diameter gas block which matches with your barrels diameter at the gas seat. This particular gas block is NOT for use with a pistol length gas system and/or high pressure rounds.Specifications and Features:AR-15 Adjustable Gas Block.750" Diameter Gas SeatLow Profile20 AdjustmentsStainless Steel Adjustment Screw and SpringMade from Carbon SteelOverall Height 1.41"Overall Weight 2.10ozNitride FinishMatte Black