A firearm accessory part has a locator module and a transmitter module. The locator module is operable to determine the locator module's position. The transmitter module is operable to transmit the position of the locator module. The firearm accessory part is a replacement part for a firearm. Removal of the firearm accessory part from the firearm may disable a feature of the firearm. Removal of the firearm from a storage device may activate the locator module and transmitter module. The invention also includes a method of assembling a firearm consisting of the steps of obtaining a firearm, obtaining a firearm accessory part, removing a part of the firearm corresponding to the firearm accessory part, and replacing the part removed from the firearm with the firearm accessory part.