MCX Ambidextrous Charge Handle After the success of the MPX charge handle, customers immediately asked 'what about the MCX ?'. You asked, Next Level Armament responded! Based upon the industries best ambidextrous charge handle designs that include models for the AR15 rifles, the AR10, the M&P 15-22 and Sig MPX , the MCX model was born. Our MCX Charge Handle is also available as a kit with our MCX Spring Plate. See note below. NOTE: Sig modified their block design with the new Virtus, but the charge handle kept the same specifications. Although our MCX Spring Plate is only compatible with their first three MCX generations, our MCX Charge Handle will work with all MCX models, including the Rattler. Therefore we are offering the handle as a stand-alone product.