A system and method for modifying a weapon with an inexpensive and easily removable attachment that is capable of recording information related to the use of the weapon and transmitting that data to a remote computing device by wired or wireless transmission means. The attachment includes one or more sensors able to record various changes and operations related to settings and usage of the modified weapon. The attachment also includes a module that contains electronics capable of one or more of the following: (i) receiving data from the one or more sensors; (ii) storing data received from the sensors; (iii) transmitting the data received from the sensors or stored data to a computing device via a wired or wireless connection.