One of our favorite adjustable gas blocks!! Fits great under minimized handguards and offers an easy to reach adjustment screw. Installation and alignment is a breeze when used with the SLR gas block jigs.

Sentry .875"  Set Screw Version - Melonite Finish

.400" Set Screw Spacing

1.8 oz

US PATENT NO. 9,410,756

- 15-position adjustability from 0 - 0.125" 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
- Stamped Alloy Flat Spring with 1400deg temper
- Melonite finish 4140 detent plunger
- USES STANDARD GAS TUBE

- Tool, roll pin and mounting screws included

Note- Needs 1.35" Minimum ID HG