SLR .625 Non-Adjustable Micro Low Profile Gas Block w/.400 in. Set Screw Spacing Black. 625 Non-Adjustable Micro Gas Block. SLR built these AR15 Gas Blocks to fit under any AR15 handguard and the melonite finish ensures these hold up for the long run. This SLR GB6 Non-Adjustable Micro Gas Block w/.400in Set Screw Spacing fits under any handguard and provides extra space for installs that will enhance your build with plenty of ease. Pick up an SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400in Set Screw Spacing for your weapon and create a more reliable and powerful gas system. Specifications for SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing: Manufacturer: SLR Color: Black Coating: Melonite QPQ Finish Fabric/Material: Steel Gas Block Journal Size-Diameter: .625 in Gun Make: AR Platform Gun Model: AR-15 Weight: 1.4 oz Additional Features: w/.400 in. Set Screw Spacing Gas System Type: Direct Impingement Features of SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing: .400 inch Set Screw Spacing. Precision bored. Fits under any AR15 handguard. Included Accessories: Set screws and roll pin Package Contents: SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing What firearm models does the manufacturer say SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing is compatible with? The manufacturer says that SLR GB6 .625 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing is compatible with AR-15SLR GB6: GB6 .625 Non-Adjustable Micro Low Profile Gas Block w/.400 in. Set Screw Spacing Black