GRIFFIN ARMAMENT 3-LUG ADAPTER
These 3 Lug adapters are HK pattern and will work with any 3 lug silencer on the market made to this standard. They will also work with Griffin 3 lug interface assemblies.
The 13.5x1mm LH version has a cylindrical machined extension added to the mount. The 13.5mm version has flats for a wrench on that cylinder extension and has the O-ring interface typical of 13.5×1 LH mounts.
Made from 17-4ph stainless and Melonite QPQ treated.