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Reviews & Ratings for SLR Sentry 6 .625 Adjustable Gas Block w/.400 in. Set Screw Spacing — 3 reviews

(3 reviews)
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
$149.09 $141.64 Save $7.45
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Most Helpful Negative Review I've had 2 of these fail already. Returning this third one I just recently purchased.
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, then put the LW BCG back in. I could not turn the gas screw back in. So I contacted SLR rifle works. They were nice enough to immediately ship me a replacement. Now I have put 100-120 rounds thru it, while being very careful to turn the gas off after each range session to remove any carbon build up. Today I shot 40 rounds and then thought it was a...
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A new review. 2019 was my last one.

by Ken, Verified Owner from FL, United States Written on August 22, 2026
I last reviewed one of these in 2019. History since then tells me that using the 110 grain black tip ammo in a short-barrel 300 blackout is the problem. Too much copper in the pistol gas system. It plates everything inside of the gas block. I have used these on several guns now with good success. Just don't even try on a pistol gas system. It will fail. At least with the solid copper ammo anyway.
Would recommend: Yes
Was it helpful to you? Yes | No
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Best adjustable gas block available for price

by Private Lawrence, Verified Owner from PA, United States Written on 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 the adjustment screw in and out while spraying Kroil penetrating oil on the adjustment screw and into the gas block.

I also apply a silver anti-seize lubricant to the adjustment screw to be able to easily turn the screw.
Pros:
  • Reliability and ease of use
Cons:
  • Needs maintenance
Best Used for:
  • Suppressed use
Would recommend: Yes
Was it helpful to you? Yes | No
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Last updated 2025-11-12 UTC.