. The typical position of arms is Shouldered Arms, which is to hold the trigger guard between thumb and index finger while the musket rests in between arm and body and against the shoulder. Right Shoulder Shift, as shown in the video, gives soldiers a little more comfort while on the march, and is easy to reach from Shouldered Arms. Going to the modern Right Shoulder Arms (as from FM 22-5) from Civil War-era Shouldered Arms would be incredibly awkward, as the soldier would have to rotate the musket 180-degrees on the same shoulder while marching.