COM-RAC AMP Arm Adapters for Peltor Comtac – bifrostgear
Arc Rail Adapter For Peltor Comtac I Ii Iii Tactical Headset, Military Airsoft Hearing Protection Electronic Headset Accessorie - Intercom Accessories - AliExpress
Helmet Rail Adapter Kit for Headsets | HHV
DLP Tac ARC Rail Adaptor Set for Peltor Comtac Headset - Team Wendy EXFIL Helmet | eBay