AAC 556-SD Fast-Attach Silencer w/ Flash Hider



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The AAC Advanced Armament 556-SD is a fast attach silencer for 5.56mm rifles. 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. The 556-SD 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.

Includes 51T 1/2×28 Blackout Flash Hider Mount.


  • Caliber: 5.56 NATO
  • Weight: 18 oz
  • Length: 6.7″
  • Diameter: 1.50″
  • Finish: Cerakote
  • Sound Reduction: 31dB*
  • Mount: 51T Ratchet Mount; 51T 1/2×28 Blackout Flash Hider Mount
  • Materials: Inconel 718, 316L SS


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