B&T USA XH-556, Suppressor, 223 Remington/556NATO, Titanium Construction, Anodized Finish, Gray, Hub Compatible SD-556RBS-SC-Ti Engineered for operators who value both maneuverability and advanced gas control, the XH-556 SC merges an ultra-compact 3D printed titanium tube with a robust 718 Inconel blast baffle perfectly tailored for the higher pressure demands of 5.56 / .223 firearms.