SLR Rifleworks Sentry 8 Clamp On Adjustable Gas Block - SKU: SA8-CM - UPC: 810646034730
Product Description
The SLR Rifleworks Sentry 8 Clamp-On Adjustable Gas Block (SA8-CM) is a premium, low-profile gas management solution designed for heavy-barrel AR-15 and AR-10 / LR-308 platforms with a .875" barrel gas journal. Featuring SLR's patented 15-position micro-detent adjustment architecture, the Sentry 8 provides precise control over gas flow from completely closed up to a .125" port opening, allowing shooters to tune cycling speeds for suppressed shooting, light-recoil loads, or heavy competition setups.
Precision CNC-machined from 4140 steel and finished in a slick, corrosion-resistant Black Melonite QPQ treatment, the Sentry 8 utilizes a Swiss precision-metering screw backed by a proprietary alloy flat spring tempered to 1400°F. This design eliminates tiny coil springs and detent balls that typically seize, rust, or fail under intense thermal stress and carbon buildup.
The clamp-on mounting configuration provides superior barrel seal, uniform pressure distribution, and maximum retention force without requiring barrel dimpling. The Sentry 8 installs easily under slim free-float handguards with a minimum 1.35" internal diameter.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits AR-15, AR-10, and LR-308 barrels equipped with a .875" gas block seat/journal. Requires a handguard with a minimum 1.35" inside diameter clearance.
- Verify host firearm is completely clear, magazine removed, and chamber visually and physically confirmed empty.
- Slide the Sentry 8 gas block onto the barrel's .875" gas journal, aligning the gas block port precisely with the barrel gas port.
- Install standard gas tube into the block and secure with the included roll pin.
- Torque clamp-on mounting screws evenly to 30-35 in-lbs to establish a gas-tight seal around the barrel.
- Use the included hex adjustment tool to dial in gas metering: turn clockwise to restrict gas flow (suppressed) or counterclockwise to open port flow (unsuppressed).
Key Features
- 15-Position Micro-Adjustability: Tactile click-detent system provides precise 0 - .125" gas port metering for optimal suppressors/load tuning.
- .875" Clamp-On Mounting Profile: Clamps securely onto .875" barrel seats for a complete gas seal without dimpling the barrel.
- Heavy-Duty 4140 Melonite Construction: Machined steel body and metering screw resist high heat, carbon fouling, and corrosion.
- High-Temp Alloy Flat Spring: 1400°F tempered flat spring replaces delicate coil springs to prevent detent seizure under rapid fire.
- Low-Profile Handguard Clearance: Slim profile fits beneath most free-float handguards with a 1.35"+ inside diameter.
- Complete Hardware Included: Comes complete with adjustment tool, gas tube roll pin, and clamp screws.
Product Specifications
- Brand: SLR Rifleworks
- MPN: SA8-CM
- UPC: 810646034730
- Gas Journal Diameter: .875 Inches
- Attachment Style: Clamp-On
- Positions: 15 Clicks (0 - .125" Opening)
- Material: 4140 Steel Body & Swiss Metering Screw
- Finish: Black Melonite QPQ
- Weight: 1.7 oz
- Platform Compatibility: AR-15 / AR-10 / LR-308 (.875 Barrel Journal)
