SLR Rifleworks Sentry 8 Set Screw Adjustable Gas Block .875"

Manufactured by SLR Rifleworks
Manufactured by SLR Rifleworks
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Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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If you are running into reliability issues with your AR-15 due to it being over-gassed or even under-gassed, then you need an Adjustable gas block. The SLR Rifleworks Sentry 8 is one of the most adjustable gas blocks with 15 different positions, so you can tube your rifle for any setup. Whether you are running an SBR, suppressed, using light varmint loads, or heavy surplus rounds, this adjustable gas block will ensure your AR is running smoothly. With positive tactile clicks between each setting and a precision machined metering screw, it allows for consistently repeatable settings. The gas block and metering screw are Melonite finished and machined out of 4140 steel to ensure a long service life. This adjustable gas block is compatible with standard gas tubes and requires a handguard with an internal diameter of 1.4” if you plan on hiding it under the handguard. The roll pin and mounting screws are included, so you can install it right out of the box. Fix your AR-15 ejection problems with the SLR Sentry adjustable gas block.

  • .875” gas block diameter set screw design
  • 15 positions with a .125” port opening
  • Metering screw and screw bore design are precision machined for repeatability and reliability
  • Includes tool to adjust the metering screw
  • Melonite finished 4140 gas block, metering screw, and detent plunger
  • Alloy flat spring with 1400 degree temper
  • Uses standard gas tube
  • Tool, roll pin, and mounting screws included
  • Needs minimum 1.4” internal diameter handguard to fit underneath
  • .400” set screw spacing
  • Weight: 1.8 oz.

SLR Rifleworks is a firearms manufacturer based in central Florida that specializes in bringing new, innovative parts to the AR-15 platform. SLR has even expanded into the AK-47 and Glock platforms with various components like stocks, muzzle devices, and magazine wells.
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BrandSLR Rifleworks
Gas Seat Diameter.875
MaterialSteel - 4140 Chrome Moly
TypeSet Screw
Weight1.8 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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