The Wolfpack Armory Night Howler Gen 3 now has improved compatibility with other manufacturers mounts. Compatible with Plan B and Rearden type tapered mounting system. FeaturesReduces muzzle flashExternal wrench flats allow removal of the muzzle device in the event of carbon lockCNC Machined from 17-4 PH stainless steel H900Depth into silencer: 1.27"Max bore hole size: 0.45"