This Griffin Armament A2 mount interface provides a high quality mounting interface for Griffin Armament GATE-LOK Flash comps, Hammer Comps, and mil-spec A2 birdcage flash hiders. The device and the collar are both compatible with the GRIFFIN ARMORERS WRENCH, GRIFFIN 1.375x24 WRENCH, and GRIFFIN REVOLUTION WRENCH. Weighing 5 ounces, the A2 adapter mount can be used on 5.56mm AR's or with the 30SD flash comp it will support centerfire calibers up to .308 Winchester. Compatible Griffin mounts:M4SD Flash CompM4SD Hammer Comp30SD Flash CompA2 compensators (within-milspec)M4SD Paladin BrakeM4SD Tactical Comp