SLR Rifleworks Sentry Titanium Adjustable Gas Block  Review – “Conventional” Lightweight AR15 Build

SLR Rifleworks Sentry Titanium Adjustable Gas Block  Review – “Conventional” Lightweight AR15 Build  SLR Rifleworks Sentry Titanium Adjustable Gas Block specs Sentry .625″ Set Screw Version (.400″ Spacing) – Titanium – Gen4 […]

SLR Rifleworks Sentry Titanium Adjustable Gas Block  Review – “Conventional” Lightweight AR15 Build

 SLR Rifleworks Sentry Titanium Adjustable Gas Block specs

Sentry .625″ Set Screw Version (.400″ Spacing) – Titanium – Gen4 – Grade 5 Titanium

22 grams!

US PATENT NO. 9,410,756

 100% Gas seal allows full cut off and prevents gas from fouling metering screw

– Complete disassembly is simple and take less than 10 seconds
– Metering screw and screw bore design allows repeatability and reliability only SLR has been able to deliver
– Single tool click to adjust gas metering
– Grade 5 Titanium
– Bead Blast Finish
–  Proprietary Alloy flat spring with 1400deg temper
– Melonite finish 4140 detent plunger
– NO tiny springs to corrode, break or seize / NO tiny ball to seize or get lost
– Tool, roll pin and mounting screws included

SLR Rifleworks Sentry Titanium Adjustable Gas Block review

The SLR Rifleworks Sentry Titanium Adjustable Gas Block is easily adjustable. The SLR gas block’s fit and finish is good, making for easy installation. The only concern is making sure to align the barrel and gas block port for the proper functioning of the rifle.

For the shooters that have not used an Adjustable Gas Block System (AGS) the way to adjust it is by:

  • Close the gas port by tightening the adjusting until it bottoms
  • Back it out one half turn
  • Put 1 cartridge in the magazine and shoot
    • If the bolt is not held open by the bolt catch, then turn the adjustment screw out either 1/4 or 1/2 turn and shoot again
    • Rinse lather repeat until the BCG is held open.
  • When the BCG locks back on an empty mag, then you can run more rounds in the magazine to insure proper ejection and feeding of the rifle and make any fine-tuning adjustments.

With the AGS properly adjusted our lightweight BCG is working like a charm, and the characteristic noise from the AR15 buffer tube is minimal.


Our accuracy testing at 100 yards was done with 6 types of ammo. The accuracy target will be revealed in our overall rifle performance review, since I consider them result of all the parts. The barrel does have the biggest job and its performance is completely dependent on the manufacturing quality, but without the rest of the parts there wouldn’t be a chance to shoot through it.

Gears rating

Gear Score
SLR Rifleworks Sentry Titanium Adjustable Gas Block is light and effective. Just what we were looking for!
Faxon Firearms ARAK 308 Jeff SHOT 2016 fireball

Check out the muzzle blast as Jeff shoots the ARAK in .308

The bleeding edge

The origins of Faxon Firearms stems out of a machining company established in 1978. Faxon is more than just a gun company, with products for a wide range of industries like medical, machinery, automotive, even air and space.

Perhaps it is the broad reach into other industries that brings Faxon Firearms a different perspective that sometimes turns the industry on it’s head. For example, Faxon’s ARAK rifle brought a unique approach to delivering a modular, ambidextrous, multi caliber rifle solution. Faxon has also hovered around the leading edge of barrel design and manufacture offering creative external treatments like the “Flame fluted barrel” featured in our 2016 Gear Report custom AR15 (build link) and the Lightweight Pencil AR15 barrel featured in this build. In fact, Gear Report’s Editor spent some quality time with the big cheese himself, Bob Faxon, in October and got the scoop on their innovative line of Glock replacement barrels with tighter tolerances and a variety of performance and aesthetic improving coatings.

Faxon Firearms Glock barrels

*Editor’s note: Yeah… I know… This is an AR15 Pencil barrel review. Why a big pic of Glock barrels? Because I think it is a cool picture. 🙂

Lightweight AR15 Review Project

With so many brands introducing light weight parts and rifles, we put together two AR15s that barely tip the scales. We call this series of reviews… the Lightweight AR Review Project.

The two rifles are:

  • “Conventional” Lightweight AR15 – mostly aluminum that has been aggressively lightened.
  • “Carbon fiber” Lightweight AR15 – combo of lightened aluminum and carbon fiber

This is our “Conventional” Lightweight Build

Each brand that sent parts for this build is featured in a separate article. This one is for Faxon Firearms.

Ammo for testing provided by

Without the support of our ammo suppliers we would not be able to do nearly the amount of gun reviews that we do today.

Defender Ammunition CompanyDefender Ammunition Company

Big thanks go to our primary Ammo Sponsor Defender Ammunition Company for supplying ammo for our tests and reviews on an ongoing basis. Defender provided a variety of calibers and types of ammo for this test. is a proud member of Team Defender

Sig Sauer

SIG provided .223 ammo for this test.

Gorilla Ammunition

Gorilla Ammo provided reman and factory .223 rifle rounds for this test.

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About JJ

JJ - Senior Firearms Review Specialist & Project Coordinator A long time friend of, and frequent behind-the-scenes instigator…I mean contributor, JJ joined the Gear Report team in 2014 in a more formal capacity. Expect to see JJ’s ongoing contributions to reviews, while he coordinates with manufacturers and retailers to review their products. If you want to see what it takes to make the cut here at Gear Report, look no further than JJ. Part inventor, part outdoorsman, JJ brings a wealth of experience to the Gear Report team, as well as some fancy book learning. A Structural Designer by day, JJ spends his nights and weekends on a massively broad range of outdoor and active interests. Whether making hunting knives, bamboo frame canoes, hunting platforms or various other creations, or hunting, fishing, paddling, boating, teaching martial arts, or re-engineering ammunition reloading equipment, JJ is always up to something interesting. Usually several somethings. A native of Guatemala, JJ brings a valuable different perspective to Gear Report. We will see if we can get him to add some Spanish language content to the site, as the need for fair, trusted information on outdoor gear is not limited to English speaking readers.