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Sentry 7 Clamp On Adjustable Gas Block

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SKU:
SA7-CM
UPC:
810646034679
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MSRP: $119.99
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SKU:SA7-CM ,UPC:

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SKU:
SA7-CM
UPC:
810646034679

Description

Sentry .750" Clamp On Version - Melonite QPQ Finish

1.3 oz

US PATENT NO. 9,410,756

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

- Tool, roll pin and mounting screws included

NOTE- If using underneath 1.3" ID HGs we recommend using a set screw block.  Will work with 1.35" ID HGs

INSTRUCTIONS

8 Reviews

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  • Bruce - Dec 11th 2018

    5

    Pros:
    -Fits inside a Geissele MK14 with a 1/10" to spare on the bottom.
    -Materials used are high quality.
    -Simple but effective design.
    -Easy to install.
    -Clamp-on > Set/Pinned.
    -Takes a TON of abuse before it seizes.
    -SLR customer service is top of the food chain.

    Cons:
    -Easy to over-tighten, use your brain and a torque wrench. Not your guessing skills.
    -Price
    -Hasn't given me more cons to include here.

    Worked wonders on a 308 build. Sentry7+RaptorSD CH and I can shoot my pig no glasses with my face right over top of the rail. Just bought another for a suppressed 10.3 ar15. Though a third screw would look bad in terms of aesthetics, I think it might be better for the design. (Less strain on bolts, even the pressure out on the barrel, increase surface area for more clamping force.)

    SLR: Please publish a study that compares clampon to set screw/pinned styles to shut up the naysayers. It's about time people are served some solid information on the subject.

  • Chris - Jun 27th 2017

    5

    First: The gas block is a great block, it works exactly as described with nice, positive clicks at each setting. The construction/craftsmanship is excellent, clearly a quality product. At the end of the day it is a gas block, so not much more else to be said about it.

    Second: SLR's customer service is awesome. Long story short: after about two years with the block the set screw seized up from not being used. Contacted customer service, got a prompt response, sent them my seized one, and about a week later I had a brand new sentry 7 sitting in my mail box. No questions, no hassle. Strongly recommend.

    As a side note, take the time to work your set screw in and out every now and then to avoid the seizing.

8 Reviews

  • Bruce - Dec 11th 2018

    5

    Pros:
    -Fits inside a Geissele MK14 with a 1/10" to spare on the bottom.
    -Materials used are high quality.
    -Simple but effective design.
    -Easy to install.
    -Clamp-on > Set/Pinned.
    -Takes a TON of abuse before it seizes.
    -SLR customer service is top of the food chain.

    Cons:
    -Easy to over-tighten, use your brain and a torque wrench. Not your guessing skills.
    -Price
    -Hasn't given me more cons to include here.

    Worked wonders on a 308 build. Sentry7+RaptorSD CH and I can shoot my pig no glasses with my face right over top of the rail. Just bought another for a suppressed 10.3 ar15. Though a third screw would look bad in terms of aesthetics, I think it might be better for the design. (Less strain on bolts, even the pressure out on the barrel, increase surface area for more clamping force.)

    SLR: Please publish a study that compares clampon to set screw/pinned styles to shut up the naysayers. It's about time people are served some solid information on the subject.

  • Chris - Jun 27th 2017

    5

    First: The gas block is a great block, it works exactly as described with nice, positive clicks at each setting. The construction/craftsmanship is excellent, clearly a quality product. At the end of the day it is a gas block, so not much more else to be said about it.

    Second: SLR's customer service is awesome. Long story short: after about two years with the block the set screw seized up from not being used. Contacted customer service, got a prompt response, sent them my seized one, and about a week later I had a brand new sentry 7 sitting in my mail box. No questions, no hassle. Strongly recommend.

    As a side note, take the time to work your set screw in and out every now and then to avoid the seizing.

  • Jon - Apr 27th 2017

    5

    Very easy to install and I did not have any issues with aligning the block to the gas port. A simple trick is the use a credit card and draw a line down the barrel and the center of your barrel's gas port.
    The block has positive detents which allows for easy adjustments, which I am able to make with my suppressor in place.
    It does help to mitigate the gas blow back, when using the suppressor. I am very pleased with my purchase.

  • Tacky - Apr 10th 2017

    5

    Bought this for a 243 winchester build to turn down the gas pressure, which is higher on the 243. The brass was showing signs of overpressure, ripped rim, and was stove piping. The loads where well within the recommended published load data so that was not the issue. I adjusted the setting to 5 and problem solved. This gas block worked well with the midwest ss gen 2 rail for the dpms lr308 platform, and .750 gas block. This is my second sentry adjustable, and I see many more in the future. I also ordered the 8" 2mm allen head driver for my 15" rail and midlength gas system, works great to make adjustments.

  • steven - Nov 29th 2016

    5

    using this on my 8.5 inch 300blkout pistol.
    took 10 mins to dial it in and have been running great for over 300+ rounds

  • Joseph Rundell - Aug 22nd 2016

    5

    Gas Block was easy to install and didnt take long to get it adjusted just right for my AR, plus the customer service from SLR is very good too!!

  • James Patterson - Feb 17th 2015

    5

    You will be happy with this block. Machining was top notch and installation was dead simple. A little Rocksett on the screws and it has held perfectly for 500 rounds. 10.5" sbr required 5 clicks running steel cased ammo to make sure it would reliably cycle. Once the system heated up, had one failure to feed. Added 1 more click and never had a problem after that with all types of 223 and 5.56. Noticeable difference in recoil and carbon during cleaning. I started at 2 clicks from bottomed out and loaded 1 round in the magazine. Fired and watched for the bolt to catch, it didn't. Repeated the process with one round and 1 click until it stayed open reliably (6 for me). It took maybe 5 minutes to get tuned. Very please, will be using these on all AR builds from here on.

  • Andrew F - Jan 4th 2015

    5

    Pros:
    - wide adjustment range (7.5" pistol and 20" rifle confirmed)
    - positive detents with good tactile feedback
    - easy to dial-in and manage recoil and over/under gassing

    Cons:
    - asymmetrical design makes alignment difficult
    - front adjustment may be blocked with larger muzzle devices
    - clamp screws are not pre-coated with thread locker

    First impressions are this is a well made and well finished device. The addition of index marks for alignment during installation and thread locker would make installation a little more convenient/easy. This is a great way to ensure a well tuned gas system, a 7.5" pistol required 4 clicks and a 20" rifle needed 12 clicks, of a maximum 18.

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