Sentry .750" Set Screw Version
.450" Set Screw Spacing - Melonite QPQ Finish
1.3 oz
US PATENT NO. 9,410,756
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" 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
- Stamped Alloy Flat Spring with 1400deg temper
- Melonite finish 4140 detent plunger
- USES STANDARD GAS TUBE
- Tool, roll pin and mounting screws included
Works with all SLR Handguards and most others
This gas block performed well at dialing down one of my over gassed rifles with a wide range of adjustment available. I have purchased this model more than once and it is low profile and also great for working with slim handguards. Make sure you purchase the Route protection service or without it you will be SOL with their customer service if the postal service loses the package.
Love using this gas block! It's super low profile and fits under my STNGR HWK and VLCN handguards. The included allen wrench is long enough to adjust the gas settings with the handguard still attached (although this will vary with the handguard and gas system lengths). Installation was super easy on my Rosco Bloodline barrels, as all that was required was lining up the set screw with the barrel's dimple (pre-dimpled from the manufacturer). I did not use Locktite as the gas block heats up too much for it to hold reliably, and the screws are still tight after firing a couple hundred rounds. Looks very easy to take apart to service or clean if needed. The locking positions in the gas block are distinct enough to use repeatably, but a little mushier than I had hoped. All things considered, still a great product at a competitive price.
This gas block performed well at dialing down one of my over gassed rifles with a wide range of adjustment available. I have purchased this model more than once and it is low profile and also great for working with slim handguards. Make sure you purchase the Route protection service or without it you will be SOL with their customer service if the postal service loses the package.
Love using this gas block! It's super low profile and fits under my STNGR HWK and VLCN handguards. The included allen wrench is long enough to adjust the gas settings with the handguard still attached (although this will vary with the handguard and gas system lengths). Installation was super easy on my Rosco Bloodline barrels, as all that was required was lining up the set screw with the barrel's dimple (pre-dimpled from the manufacturer). I did not use Locktite as the gas block heats up too much for it to hold reliably, and the screws are still tight after firing a couple hundred rounds. Looks very easy to take apart to service or clean if needed. The locking positions in the gas block are distinct enough to use repeatably, but a little mushier than I had hoped. All things considered, still a great product at a competitive price.
I purchased this SA7-450-SM gas block after experiencing blown primers and cycling issues in a 16" 5.56mm, mid-length barrel paired with an AR-15 bolt carrier. I judged the barrel gas hole was too large for my original GB7-450 gas block and H1 buffer in combination with the dwell length and BCG. After replacing the fixed gas block with this adjustable and swapping buffers, the carbine cycles flawlessly (with either an H2 or H3 buffer). I've bought a second SA7-450-SM for a 6.5 Grendel upper and will get a third for a 224 Valkyrie upper. The adjustments are excellent, allow for fine tuning and will be a bonus for suppression.
Running this block on my 6" 5.56 SBR. The gas block is fantastic and allows the user the adjust for all types of ammo suppressed or unsuppressed. If you have and SBR, I would highly recommend getting this gas block. Hands down the best adjuatable gas block on the market! The customer service is exceptional too!
