SLR .936 Non-Adjustable Micro Low Profile Gas Block w/.400 in. Set Screw Spacing Black. 400 Screw Spacing is built to provide the reliable performance that an AR shooter demands. Whether you need a replacement or want to build your own the SLR Micro Gas Block .936 w/.400 Screw Spacing is just what you need. These AR15 Gas Blocks by SLR are built with a melonite finish for extra-long life and simple cleaning. The SLR GB9 Non-Adjustable Micro Gas Block have set screw spacing of .400 inches and are incredibly compact so that they may be mounted just about anywhere including under a handguard. When you need a high-quality gas device for your air gusset rifle look no further than the SLR GB9 Non-Adjustable Micro Gas Block w/.400 Screw Spacing. Specifications for SLR GB9 .936 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing: Manufacturer: SLR Coating: Melonite QPQ Finish Gas Block Journal Size-Diameter: .936 in Gun Make: AR Platform Gun Model: AR-15 Additional Features: w/.400 in. Set Screw Spacing Gas System Type: Direct Impingement Features of SLR GB9 .936 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 GB9 .936 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing What firearm models does the manufacturer say SLR GB9 .936 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing is compatible with? The manufacturer says that SLR GB9 .936 Non-Adjustable Micro Gas Block w/.400 in. Set Screw Spacing is compatible with AR-15SLR GB9: GB9 .936 Non-Adjustable Micro Low Profile Gas Block w/.400 in. Set Screw Spacing Black