I was the smallest in my section (about 65 kgs / 140 lbs) and you couldn't drag it away from me. There's something just so RIGHT about a belt fed automatic weapon in your hands. :P
That and I got to aways ride with my head out the cargo hatch in the M113, first and last half picket at night, and rarely was assigned to the assault group rather than fire support in an attack.
Ah, the perks of a machinegunner!
Mind you I never had a decent assistant gunner worth anything more than an ammo mule so I got real good at changing barrels fast by myself and carrying out all the various stoppage drills.