Dark Storm Industries Railed Gas Block Billet Aluminum .750. Different size gas blocks can be used with different barrels. Dark Storm Industries tries to make products that will work with all barrel sizes. We do this by providing several different kinds. These are just some of the things that can be found in a Dark Storm Industries .750 railed gas block. Since barrels .750 and above are standard it is important to select the right gas block. Gas blocks that are made to this dimension should have a larger barrel. Specifications for Dark Storm Industries Railed Gas Blocks Billet Aluminum .750: Manufacturer: Dark Storm Industries Color: Black Fabric/Material: Billet Aluminum Size: .750 Additional Features: Top Picatinny Rail Last Chance: Yes Features of Dark Storm Industries Railed Gas Block Billet Aluminum .750 Lightweight Billet Aluminum Top Picatinny Rail Fits .750 diamer barrels Secured with three allen head set screws on bottom Package Contents: Dark Storm Industries Railed Gas Block Billet Aluminum .750 Roll Pin for Gas Tube Dark Storm Industries DSI-BRL-GBR-750: Railed Gas Block Billet Aluminum .750