The Comstock Armory Low Pro Suppressor Adapter is a low profile suppressor adapter compatible with Comstock, Rearden, and other common Plan-B muzzle devices. The titanium version is currently the lightest Plan-B HUB adapter on the market at just 0.9 ounces. FeaturesAllows for the quick attachment and removal of suppressorsStandard 1.375-24 threads (also known as HUB or Bravo) for use on most rifle suppressors1-1/16" wrench flats for easy installation and removal0.3" added length