Odin Works Adjustable Low Profile Gas Block, .750 Diameter, Black, Not For Pistol Length Gas Systems GB-ADJ Other gas blocks are tunable" but the Adjustable Gas Block from ODIN Works is truly adjustable and packed with features. Machined from steel and black nitrided for durability. Front facing stainless steel adjustment screw and spring to handle high temperatures. 20 clicks of ball detent adjustment" no set screws needed" simply adjust the stainless screw where you want it and you're done. Will fit any barrel with .750" diameter and works with any caliber.