SLR Rifleworks Sentry Adjustable Gas Block Set Screw

SLR Rifleworks Sentry Adjustable Gas Block Set ScrewSpecifications:.400" Set Screw Spacing1.3 ozUS PATENT NO. 9,410,75615-position adjustability from 0 0.125" port openingMetering screw and screw bore design allows repeatability and reliability only SLR has been able to deliverSingle tool click to adjust gas meteringMelonite finish 4140 Precision machined gas blockMelonite finish 4140 Nexturn Swiss precision metering screwStamped Alloy Flat Spring with 1400deg temperMelonite finish 4140 detent plungerUSES STANDARD GAS TUBETool, roll pin and mounting screws includedWorks with ALL AR15/AR10 HandguardsNote If you have a barrel with no dimple or one dimple under the gas port either our .400 or .450 set screw spacing blocks will work fine. There is no difference in the blocks just the front set screw location.