Crye AVS™ Customization Kit Main Categories_Training Equipment PVS 31C MOD combines ergonomic design with New_New PVS 31C MOD combines ergonomic design with improved functionality and accommodates features such as a dedicated Instant On IR button: this enables to quickly and momentarily engage IR illuminator without having to operate the switch to communicate between crew members using Morse code AUFIRE conditions trainees to maintain accuracy and decision making under true stress allowing chest rigs various Crye Precision™ products on our website may be on back order and their availability or estimated time of arrival may are subject to the scheduled production runs that are solely determined by Crye Precision™