Re: O.C.C
Hmmm, advantages all around. The m240 has ammo compatibility with what we already have, pretty versatile as well. The m2 is just darn handy and a good option, probably my personal pick, though ammo may be harder to find. The m19 just makes me giggle, on a personal level I love it and it is a close second to the m2, but ammo is going to be at least as hard to find, but the punch is handy.
Over all I would say m2/m19 as my primary pick, I am ok with either, and m240 as the secondary pick for versatility and ammo compatibility. In truth I think any of the three will serve us well.