I think each weapon should have its own weight factored into the stamina meter. Say a weapon weighed 14lbs, then you would drain your stamina slightly faster than someone who had a weapon weighing 8lbs. I think this could be useful for weapon choices between the standard Mosin Nagant and the M38/M44. It could also be used if someone needed to sprint to a position quickly and dump all his weapons and ammo. It would also make the MG carrier realistically slower.