SLR Sentry Adjustable Gas Block .875" Set Screw Version with Melonite Finish (SA8-SM) has a.400" set screw spacing, weighs 1.30oz, and a single tool clicks to adjust gas metering.

Features:

• 100% Gas seal allows full cut off and prevents gas from fouling metering screw
• Complete disassembly is simple and take less than 10 seconds
• Metering screw and screw bore design allows repeatability and reliability only SLR has been able to deliver
• Single tool click to adjust gas metering
• Melonite finish 4140 Precision machined gas block
• Melonite finish 4140 Nexturn Swiss precision metering screw
• Proprietary Alloy Flat Spring with 1400deg temper
• Melonite finish 4140 detent plunger
• NO tiny springs to corrode, break or seize / NO tiny ball to seize or get lost
• USES STANDARD GAS TUBE
• Tool, roll pin and mounting screws included