The MG13 was an interim machine gun used by the German military in the 1930s until the MG34 was adopted and widely issued. The MG13 (so designated to allow a claim that it was a WW1 era design, not a new development by Rheinmetall in the 1920s) was a closed-bolt, magazine fed, short recoil, hammer fired design. It has a particularly interesting mechanism allowing the recoil spring tension to be adjusted, and also has a folding stock - an unusual feature on a light machine gun. Fed by both 25 round box magazines and 75 round double drums, this particular example is a Portuguese contract example designated the M938. Today’s video will focus on the mechanical operation of the gun, rather than its developmental history.