The ShivWorks Extreme Close Quarter Concepts (ECQC) course offers a multi-disciplinary approach to building functional, combative handgun skills at zero to five feet. The course is designed to instill core concepts of seamless integration and provide the platform for aggressive problem solving during a life or death struggle at arm’s length or closer. We emphasize the common body mechanics that apply across different skill sets. That way, all combative software is reinforcing. Once students’ skill sets are ingrained, they will be stress inoculated with force-on-force drills using marking cartridges and protective equipment.