Silencerco

This 3-prong flash hider is compatible with the SilencerCo ASR mounting system available on the Specwar, Omega, Saker (with ASR MAAD Module) and Hybrid and Harvester Big Bore (with ASR Mount)

Three prong flash hiders are very effective; but, they also tend to act like a tuning fork and cause a ringing sound.  The Trifecta mount eliminates the ringing by using 3 prongs that are all slightly different length.