SureFire SOCOM 4 Prong Flash Hider Suppressor Mount 223 Remington 556 NATO 1 2x28 RH Black FH556RC 1 2 28 UPC 084871318631
Product Description
The SureFire® SOCOM 4-Prong Flash Hider (SKU: FH556RC-1/2-28 / UPC: 084871318631) is the legendary muzzle interface selected by the United States Special Operations Command (USSOCOM) for the M4A1, Mk18, and URGI combat weapon programs. Developed specifically to fulfill demanding Department of Defense solicitation protocols, this open-prong flash suppressor drastically mitigates muzzle flash signature—neutralizing greater than 99% of visible light signature to preserve dark-adapted night vision and keep the operator concealed in low-light environments. Beyond standalone flash suppression, it acts as an unyielding, precision-indexed foundation for all SureFire SOCOM Fast-Attach® sound suppressors.
Every FH556RC-1/2-28 muzzle device is CNC-machined from U.S. mill-certified, heat-treated stainless steel bar stock to maintain rigid concentricity with the rifle bore. The outer surfaces and critical mounting interfaces are protected with an advanced Diamond-Like Carbon (DLC) coating. This resilient surface treatment provides an ultra-low coefficient of friction, impervious resistance to gas erosion, high-temperature oxidation resistance, and superior defense against moisture and corrosive propellants, ensuring carbon build-up wipes away effortlessly after high-round-count firing schedules.
Engineered for high-tempo tactical operations and combat clones, the SureFire 4-prong profile incorporates specialized labyrinth seals along the secondary mounting collar to prevent blowback gas leakage and mitigate carbon buildup on the suppressor locking ring. The base includes a pre-drilled blind hole at the 6 o'clock position, allowing armorer pin-and-weld staging on 14.5-inch carbine barrels to achieve a legal 16.0-inch non-NFA configuration. Whether utilized bare or hosting a SOCOM556-RC2 or RC3 can, the SF4P represents the benchmark in modern combat muzzle architecture.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct-thread mounting for all 5.56x45mm NATO, .223 Remington, and .22 ARC barrels featuring standard 1/2x28 right-hand threads with a 90-degree square shoulder. Fully compatible with all SureFire SOCOM Series 5.56mm Fast-Attach® suppressors, Warden blast diffusers, and trainer cans. CRITICAL: Incompatible with legacy SureFire pre-SOCOM Fast-Attach silencers. Under NO circumstances should a standard peel or crush washer be utilized during installation, as uneven crush washer expansion will induce baffle strikes. Use ONLY the supplied precision-ground stainless steel shims and high-temperature Rocksett ceramic adhesive. Tighten to 20 to 30 ft-lbs using an armorer wrench across the flats.
- Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty.
- Thoroughly clean all carbon, grease, and factory oil from the barrel threads and muzzle shoulder using acetone or isopropyl alcohol, allowing the steel to completely dry.
- Perform a dry timing check without adhesive: slide the thick chamfered base shim (chamfer directed inward toward the barrel shoulder) onto the threads, test fit combination shims, and thread the 4-prong flash hider on hand-tight until the top prong or index notch properly aligns at top-dead-center (12 o'clock).
- Apply 2 to 3 drops of Rocksett liquid to the clean barrel threads; use an armorer wrench on the precision wrench flats to torque the flash hider into final alignment at exactly 20 to 30 ft-lbs.
- Inspect internal bore concentricity using an armorer suppressor alignment rod with your SureFire SOCOM suppressor locked in place, and allow the Rocksett to cure undisturbed for a minimum of 24 hours prior to live-fire operations.
Key Features
- USSOCOM Combat Pedigree: The authentic military-issue 4-prong flash suppressor selected by USSOCOM for Tier-1 carbines, URGI uppers, and Mk18 weapon systems.
- Extreme Flash Elimination: Engineered 4-prong geometry yields greater than 99% flash reduction compared to a bare muzzle, preserving night-vision optics and visual stealth.
- SOCOM Fast-Attach® Compatibility: Serves as a rock-solid, repeatable mounting platform for SureFire SOCOM 5.56 sound suppressors, Wardens, and trainers.
- Integrated Labyrinth Seals: Precision rear collar seals capture expanding gas to prevent carbon migration, carbon-locking, and blowback leakage onto the collar.
- Pre-Drilled Pin-and-Weld Index: Pre-drilled pilot hole located at the 6 o'clock position facilitates permanent pinning and welding to 14.5-inch barrels for non-NFA 16.0-inch overall length compliance.
- Diamond-Like Carbon (DLC) Finish: High-hardness, corrosion-proof DLC surface treatment resists heat pitting, propellant chemicals, and extreme mechanical friction.
Product Specifications
- Brand: SureFire®
- Model/Series: SOCOM 4-Prong Flash Hider (SF4P)
- MPN / SKU: FH556RC-1/2-28 / FH556RC1228
- UPC: 084871318631
- Thread Pitch: 1/2x28 RH
- Caliber Compatibility: 5.56x45mm NATO / .223 Remington
- Material: Heat-Treated U.S. Mill-Certified Stainless Steel
- Finish: Black Diamond-Like Carbon (DLC)
- Overall Length: 2.60 in (6.4 cm)
- Weight: 3.9 oz (110.5 g)
- Suppressor Attachment: SureFire Fast-Attach® SOCOM Series
- Package Contents: Flash Hider, Precision Stainless Shim Kit, Rocksett Adhesive (0.5ml), Armorer User Manual
- Country of Origin: United States of America
