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Questions & Answers
Will this install under a 1.3" handguard? Expert Answer

Yes. The SLR Sentry 6 .625 Adjustable Gas Block, according to the manufacturer, will fit with all AR15 and AR10 handguards.

by Ethan, Gear Expert, May 10, 2022
Customer Reviews
Helpful Negative Review I've had 2 of these fail already. Returning this third one I just recently purchased. by Ken, Verified Owner, August 28, 2019
I had one of these in size .750 on my 300 Blackout pistol. Shot it for maybe 200 rounds with a lightweight bolt carrier in the gun. Decided to try a full-weight BCG, so opened the gas port up as necessary for the heavier BCG. Shot maybe 60-80 rounds,...
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5/9 found this helpful
Most Recent Reviews Best adjustable gas block available for price by Private Lawrence, Verified Owner, July 16, 2023
This is a great adjustable gas block! I have one like this one and also a similar SLR titanium adjustable gas block. Be aware that adjustable gas block must have routine maintenance so they do not carbon lock up and stop working. I routinely turn ...
Read More...
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Product Info for SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing

Features/Specifications:image

.400 inch Set Screw Spacing.

Note- 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.

15-position adjustability from 0 - 0.125 inch 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 Nexturn Swiss precision metering screw.

Proprietary Alloy Flat Spring with 1400deg temper.

Melonite finish 4140 detent plunger.

USES STANDARD GAS TUBE.

Works with ALL AR15/AR10 Handguards.

Included Accessories:

Tool, roll pin and mounting screws

Specifications for SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing:

Manufacturer: SLR
Coating: Melonite QPQ Finish
Gas Block Journal Size-Diameter: .625 in
Gun Make: AR Platform
Additional Features: w/.400 in. Set Screw Spacing
Gas System Type: Direct Impingement

Features of SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing:

  • .400 inch Set Screw Spacing.
  • Note- 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.
  • 15-position adjustability from 0 - 0.125 inch 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 Nexturn Swiss precision metering screw.
  • Proprietary Alloy Flat Spring with 1400deg temper.
  • Melonite finish 4140 detent plunger.
  • USES STANDARD GAS TUBE.
  • Works with ALL AR15/AR10 Handguards.
  • Included Accessories:
  • Tool
  • roll pin and mounting screws

Package Contents:

  • SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing

SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing Orderable Models

List of Orderable Models

SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing, Black, SA6-SM , MPN: SA6-SM , UPC: 810646034631 , Code: 39E-RGB-SLRSEN6W400-SA6-SM
SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing, Titanium, SA6-TI-S , MPN: SA6-TI-S , Code: 39E-RGB-SLRSEN6W400-SA6-TI-S
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