At low BR, SMGs rule the game. LMGs like the MG13 and Madsen have smaller mags, slower ADS, and slower sprint speed, so they’re way less flexible. Even when used for holding angles, their low ammo capacity makes them far less effective than SMGs.
So I suggest increasing their ADS and sprint speed to enrich the gameplay experience with each weapon type and allow them to better compete with SMGs.
Should be 65% sprint speed and 0.5 ADS speed. This is the baseline. Anything lower should be brought up to this level, and anything higher should stay as is.