The BAR (20) can fight the MG34 (50) given the difference in movement, ads, accuracy and magazine size and rate of fire. The Johnsons LMG (20) is not equal to the MG3 with 75 rounds. A 40 round bar would be a better match up with perhaps a slight mobility nerf.Johnston Model D1918 machine gun 
or an actual br4 mg Johnston Model D1918 machine gun