Browsing the latest wares on ARFCOM's USSOF thread (that's US Special Operations Forces), I found this pic of a MK48 fed by a MK19 ammo can and feed belt that's welded to the frame of a rucksack:
Who really neeeeeeeeds that many rounds of ammunition? That's just begging for J. Q. Public to buy for like $12 from a gunshow (or make in their basement) and use to terrorize places of peace and tranquility! Why are y'all laughing?