BlackHawk / SilencerCo ASR Flash Hider 5/8x24 (7.62mm Gas Can) 

This Blackhawk 3-prong flash hider is compatible with SilencerCo Specwar, Saker, Omega, Hybrid, and Harvester Big Bore suppressors equipped with the ASR mounting system, as well as the Blackhawk Gas Can suppressor. When combined with an ASR compatible suppressor it offers a quick one hand on, one hand off attachment/detachment.