The Bifrost Gear COM-RAC for Howard Leight allows operators to easily convert their Howard Leight Impact Sport headsets to work with the Ops-Core AMP Helmet Rail Mount Kit (RAC Arms) Features: Converts OPS-Core AMP arms to work with Howard Leight Impact Sport Headsets Allows headsets to attach to rear dovetails on ARC rails Installs in seconds, no modifications to OPS Core AMP arms or headsets required Compatible with the following headsets: Howard Leight Impact Sport (Includes one pair of adapter brackets; OPS-Core AMP Helmet Rail Mount Kit and headset not included) US and International Patents Pending