There is disclosed an automatic or semiautomatic firearm having one or a plurality of parallel rail attachments for weapon attachments (accessories) with a central power source capable of powering the accessory devices electrically connects through a series of parallel rails circumferentially surrounding a barrel of the firearm. More specifically, there is disclosed a central power source to power up one or a plurality of rail accessories that provides power to each rail accessory through, preferably, a copper or brass strip located on each rail element. In addition, there is disclosed a method for transmitting information among and between weapon attachments using the rails as an antenna and radio frequency transmission of digital or analog signals to receiver units in each attachment of within a central bus.