The Comstock Armory 4 Prong Flash Hider is compatible with common .900"-24 adapters like the Comstock LPA, Q Plan-B, and Rearden Atlas. The 4-Prong offers the best possible flash performance and features mass shifted tines to prevent the ringing noise that affects many other pronged flash hiders. FeaturesAllows for the quick attachment and removal of suppressorsHigh strength 17-4 PH stainless steelDurable black nitride finish13/16" wrench flats for easy installation and removalEffectively hides muzzle flashRotationally symmetric and does not need to be timed with shimsMass shifted tines to prevent ringing2" overall length (~1.36" length added to muzzle)