The FH556-215A is a high-performance flash hider for the Colt Commando, M4, M16, HK416, and to other 5.56 mm semi-auto, bolt-action, or assault rifles with Mil-Spec 1/2-28 muzzle threads. It also serves as a precision, rock-solid adapter mount that enables rapid no-tools attachment of SureFire FA556K, FA556-212, FA556MG, or MINI suppressors to these rifles or to other rifles with the same muzzle thread/configuration.
The end of this adapter has 4 open prongs. This is the originial Surefire 4-prong, and its larger cousin is found on the British L129A and the HK 417 rifles in 7.62mm NATO.
SureFire flash hiders deliver superior muzzle flash suppression. This provides three benefits—minimizing degradation of your night-adapted vision, helping to conceal your position, and reducing muzzle rise. Machined from heat-treated stainless steel, finished in a tough, corrosion-resistant coating, all SureFire flash hiders are extremely resistant to gas and particle erosion and will perform perfectly for thousands of rounds.
NOTE: This SureFire flash hider also serve as adapter mounts for our Fast-Attach® sound suppressors. If you do not plan to attach a SureFire sound suppressor to your firearm, we recommend choosing a shorter-length muzzle brake or flash hider. SureFire muzzle brakes and flash hiders that mate with our overlap suppressor models are longer in order to extend rearward over the barrel, a feature that is unnecessary unless mounting an overlap suppressor.
The Fast Attach family of Suppressors and muzzle devices predate the SOCOM series, and while the flash hider looks similar, this flash hider is not be used with the SOCOM RC / RC2 familiy of suppressors. The SOCOM series of Surefire suppressors will actually seem to fit, but will not lock in place and presents a danger when shooting, and should not be used.
Charlie's recommends installation by a gunsmith or qualified armorer. While this can be a DIY project, it is important to get the timing correct and also to apply the correct Rockset to assure your mount does not cause damage to your suppressor.