SLR GB6 .625 Non-Adjustable Micro Low Profile Gas Block w/.450 in. Set Screw Spacing Black. 450 inch Set Screw Spacing. Precision bored. Fits under any AR15 handguard. Included Accessories: Set screws and roll pin Specifications for SLR GB6 .625 Non-Adjustable Micro Gas Block w/.450 in. Set Screw Spacing: Manufacturer: SLR Gas Block Journal Size-Diameter: .625 in Gun Make: AR Platform Gun Model: AR-15 Additional Features: w/.450 in. Set Screw Spacing Gas System Type: Direct Impingement Features of SLR GB6 .625 Non-Adjustable Micro Gas Block w/.450 in. Set Screw Spacing: .450 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/.450 in. Set Screw Spacing What firearm models does the manufacturer say SLR GB6 .625 Non-Adjustable Micro Gas Block w/.450 in. Set Screw Spacing is compatible with? The manufacturer suggests that SLR GB6 .625 Non-Adjustable Micro Gas Block w/.450 in. Set Screw Spacing is compatible with AR-15SLR GB6-450: GB6 .625 Non-Adjustable Micro Low Profile Gas Block w/.450 in. Set Screw Spacing Black