The Griffin Armament M4SD Linear Comp is the only muzzle device from Griffin Armament without any side ports, thus reducing side blast to other people beside the shooter's position. Instead it features three ports on top for muzzle neutrality as well as a de Laval nozzle in front to project linear flow of pressure down range. The Airsoft version has been designed to be compatible with any A2-compatible suppressor mount including the PTS Griffin Armament M4SD Suppressor.