USED SLR Sentry 7 .750 Adjustable Gas Block w/.450 in. Set Screw Spacing Titanium SA7-TI-S-450. 750 Adjustable Gas Block w/ .450 in. Set Screw Spacing. Regardless of the option you choose each AR Gas Blocks by SLR contains a Melonite QPQ finish that greatly increases the corrosion resistance to provide more reliable service and a longer lifespan. This SLR Sentry 7 .750 Adjustable Rifle Gas Block offers 15 positions of adjustability to fit your exact firearm and shooting style the best and these blocks come with everything you need to install them on your firearm. Enhance your weapon with the SLR Sentry 7 Set Screw Adjustable Gas Block for top-shelf performance with every pull of the trigger. Specifications for SLR Sentry 7 .750 Adjustable Gas Block w/ .450 in. Set Screw Spacing: Manufacturer: SLR Coating: Melonite QPQ Finish Size: 0.75 Caliber: .750 Nitro Express Gun Make: AR Platform Additional Features: w/.450 in. Set Screw Spacing Gas System Type: Direct Impingement Features of SLR Sentry 7 .750 Adjustable Gas Block w/ .450 in. Set Screw Spacing: 15-position adjustability from 0 - 0.125in port opening 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 USES STANDARD GAS TUBE Tool roll pin and mounting screws included Package Contents: SLR Sentry 7 .750 Adjustable Gas Block w/ .450 in. Set Screw Spacing Tool Roll pin Mounting screws SLR SA7-TI-S-450: Sentry 7 .750 Adjustable Gas Block w/.450 in. Set Screw Spacing Titanium