Griffin Armament GATE-LOK Closed Tine Flash Hider Steel Black XHP556CTFH UPC 689396838307
Product Description
The Griffin Armament GATE-LOK Closed Tine Flash Hider (XHP556CTFH) is a precision-engineered 5.56mm muzzle device designed to combine aggressive muzzle flash suppression with seamless suppressor integration. Featuring Griffin Armament's proprietary GATE-LOK mounting interface, this closed-tine muzzle device serves as a fast-attach mounting solution for Griffin M4SD series silencers and A2-style GATE-LOK quick-detach suppressors.
Precision CNC-machined from 17-4 PH stainless steel and finished in a durable black QPQ Nitride finish, the XHP556CTFH resists high heat, gas erosion, and severe corrosion under intense firing schedules. The closed-tine outer profile eliminates snagging on vegetation, gear, and vehicle interiors during field movement, while internally tuned flash ports disrupt expanding propellant gases to suppress visible signature in low-light environments.
Threaded in standard 1/2x28 tpi for 5.56 NATO and .223 Rem barrels, the GATE-LOK Closed Tine Flash Hider includes a timing shim set to ensure precise indexing during installation. Built in the USA, it delivers duty-grade muzzle control and rock-solid silencer lockup for tactical, defensive, and hard-use carbine setups.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Threaded 1/2x28 tpi for 5.56 NATO, .223 Rem, and .224 Valkyrie barrels. Serves as a mounting interface for Griffin Armament GATE-LOK / M4SD series suppressors and compatible A2-style QD silencers.
- Perform a complete firearm safety check: drop the magazine, lock the bolt rearward, and visually inspect the chamber to verify zero live rounds are present.
- Clean barrel muzzle threads thoroughly and inspect for debris or thread damage.
- Select the proper combination of included timing shims to achieve correct indexing alignment (do not use crush washers when mounting suppressors).
- Apply a high-temperature anti-seize compound or Rocksett to the barrel threads.
- Thread the XHP556CTFH onto the muzzle hand-tight, then use an armorer wrench to torque to 25–30 ft-lbs.
- Verify suppressor alignment with an alignment rod prior to live-fire suppressed shooting.
Key Features
- GATE-LOK Fast-Attach Suppressor Interface: Precision-machined interface provides a secure, gas-tight mounting foundation for Griffin GATE-LOK / M4SD series suppressors.
- Closed-Tine Snag-Free Geometry: Ringed outer tine structure prevents snagging on sling webbing, brush, or tactical gear while preserving maximum flash reduction.
- 17-4 PH Stainless Steel Construction: High-strength stainless steel alloy resists high gas pressure, heat erosion, and harsh firing schedules.
- QPQ Nitride Black Finish: Ultra-hard surface treatment delivers superior corrosion resistance and wear protection.
- Tuned Flash Reduction Ports: Engineered port geometry breaks up muzzle blast and eliminates visible flash signature in low-light conditions.
- Includes Timing Shim Set: Complete with precision shims for accurate indexing without the bolt face deflection risks of crush washers.
- Made in the USA: Proudly engineered and manufactured in the United States.
Product Specifications
- Brand: Griffin Armament
- Model/Series: GATE-LOK Closed Tine Flash Hider
- MPN / SKU: XHP556CTFH
- UPC: 689396838307
- Caliber: 5.56mm NATO / .223 Remington
- Thread Pitch: 1/2x28 tpi
- Suppressor Mount Interface: Griffin GATE-LOK / M4SD Series
- Material: 17-4 PH Stainless Steel
- Finish / Color: Black QPQ Nitride
- Overall Length: 2.25 in
- Weight: 3.3 oz
- Country of Origin: USA
