Gas Block Genie Gas Block Alignment Tool For Ar-15. Gas Block Genie allows you to install your gas block to the perfect depth and angle on the first shot. It's reusable and comes with instructions. All you'll need is a very fine point marker or scribe. Standard size Gas Block Genie. Fits all .750" barrels. Specifications for Gas Block Genie Gas Block Alignment Tool For Ar-15: Manufacturer: Gas Block Genie Condition: New Fabric/Material: Plastic Gun Model: AR-15 Features of Gas Block Genie Gas Block Alignment Tool AR15 3A5-G5-GASBLOCKGENIE: Works with all styles of gas blocks including clamp-on Easy 5-step process ensures a perfectly aligned gas block Package Contents: Gas Block Genie AR15 Gas Block Alignment Tool 3A5-G5-GASBLOCKGENIE The Gas Block Genie Gas Block Alignment Tool For Ar-15 is a quality addition to the Gas Block Genie lineup. For more great deals on Gunsmithing Equipment by Gas Block Genie please browse our Gas Block Genie Gunsmithing Equipment page. What firearm models does the manufacturer say Gas Block Genie Gas Block Alignment Tool For Ar-15 is compatible with? The manufacturer says that Gas Block Genie Gas Block Alignment Tool For Ar-15 is compatible with AR-15