Wouldn't be shocking, I used to get put on Ammo Depot guard with a M16 and 5 rounds. I mean seriously, if your going to put me on a allegedly important guard detail, at least give me enough rounds to do something if the need arises.
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Typically your stereotypical "machine guns" are going to be belt fed. Otherwise it will be a submachine gun ALA MP-7 or UZI, which outside of SF, you won't see issued to soldiers.
Standard machine gunsare going to be M249's M240's or, if the unit wants to go old school M60's