Advanced Armament Corp

The 556-SD is a fast attach silencer for 5.56mm hosts. With a design based on an earlier version of the best selling M4-2000, the compact and lightweight 556-SD offers consumers feature-rich content and excellent value. It uses the tried and true 51T Ratchet Mount fast-attach system that enables users to install or remove the silencer in seconds. The baffle core of the 556-SD features 100% Inconel 718 and full circumferential fusion welding to provide a lifetime of use under the most demanding conditions. The 556-SD includes a 51T 1/2x28 Blackout Flash Hider Mount.