Abstract: An attachment firearm training device (10) for attachment to a firearm, firearm simulator, or firearm replica having a firearm body (12) includes motion detection hardware to acquire data associated with motion of the firearm body during a dry-firing or live-firing training session. The motion detection hardware includes one or more accelerometers and/or one or more gyroscopes. Other suitable motion detection hardware may also be included. A motion signal representative of actual movement of the firearm body is used to generate one or more motion path lines that are displayed on a display. Each motion path line is representative of the actual motion of the firearm body before a shot, during a shot, during recoil, and/or after recoil so a user may analyze whether desired motion of the firearm body is actually being achieved.