Another pistol to carbine conversion kit that can be used in airsoft spotted. Bang Bang Big Boys Toys, the upscale shop owned by the Airsoft Surgeon got in stock the IMI Defense KIDON Kit for the M&P pistol is posted on their Facebook Page. According to IMI, the Kidon is a Gen-2 polymer universal pistol conversion kit designed to quickly and easily transform virtual any full-size railed pistol into an M1913 accessory customizable platform.