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SLR Rifleworks

SLR Rifleworks Sentry 7 Adjustable Gas Block

Side-adjustable click gas block with 15 detented positions. The competition shooter's pick: dial in with a single tool from the side, no handguard removal.

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Quick Specs

Price
$119
Weight
1.8 oz
Brand
SLR Rifleworks
Category
gas-component

Features

  • 15-position click adjust, single-tool
  • .750 inch journal (Sentry 7 designation)
  • 4140 steel with Melonite QPQ finish
  • Clamp-on or set-screw mounting
  • 1.8 oz weight

Capability Boosts

Suppression+2
Reliability+1

Recommended For

Outdoor Defense+3
suppressed shooting+3
suppressed use+3
suppressor host+3
Home Defense
Duty/Patrol

+11 more

Where to Buy

Compare current prices and availability from retailers we work with.

Optics Planet

SLR Sentry 7 .750 Adjustable Gas Block w/.400 in. Set Screw Spacing, Black, SA7-SM

$141.64
Verify stock
4d ago
View offer

Compatibility Tags

family: ar-pattern

Overview

The SLR Rifleworks Sentry 7 is a 15-position side-adjustable click gas block built for AR-15s with .750 inch barrel journals. SLR's metering screw is captive, click-detented, and accessible from the side of the block, which means tuning is a single-tool operation that does not require pulling the handguard. The clamp-on and set-screw variants share the same internals; the clamp-on is the easier install on a non-dimpled barrel, while the set-screw model demands a 1.35 inch minimum inside-diameter handguard like SLR's own Ion or Helix rails to allow tool access through a side cutout.

Internally, the Sentry 7 is a restrictive design: each detent closes off more of the gas port, choking flow into the gas tube. That makes it the right choice for precision and competition guns where you want a known, repeatable setting per ammunition lot. It is less ideal as a dedicated suppressor host gas block than a bleed-off design like the Superlative Arms, because trapped gas still routes back through the action under a can. The 4140 steel body and Melonite QPQ finish handle heat and carbon better than aluminum or unfinished steel, and SLR backs the design with US Patent 9,410,756.

The Sentry 7 is the standard pick for the typical 5.56 build with a .750 journal barrel; choose the Sentry 8 only if your barrel measures .875.

Key Features

  • 15 detented click positions from fully open to fully closed
  • Side-mounted metering screw with single-tool access
  • Captive adjustment screw cannot back out under fire
  • 4140 precision-machined steel body, Melonite QPQ finish
  • Clamp-on and set-screw mounting variants available
  • 1.8 oz weight, low-profile under most M-LOK rails
  • Compatible with standard mil-spec gas tubes

Pros

  • +Side-adjustable means no handguard removal to retune for a new load
  • +Captive click-detented screw stays put under sustained fire
  • +Clamp-on variant installs without dimpling the barrel
  • +Melonite QPQ finish resists heat discoloration and carbon
  • +Backed by patent and a 4140 steel construction

Cons

  • Set-screw variant needs 1.35 inch ID handguard for side access
  • Restrictive design less ideal than bleed-off for full-time suppressed hosts
  • Sentry 7 is .750 only; .875 buyers need the Sentry 8 SKU
  • Premium price vs basic set-screw adjustable blocks

Detailed Specifications

adjustmentPositions
15 detented click positions
adjustmentLocation
Side-mounted captive screw
journalSize
.750 inch (Sentry 7)
Material
4140 steel
finish
Melonite QPQ
weight
1.8 oz
mountingStyles
Clamp-on or set-screw
handguardClearance
Set-screw variant requires 1.35 inch min ID
patent
US 9,410,756
sku
SA7-SM

Compatible Platforms

+84 more

Pairs Well With

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