OIF I and II, the MK19 gunners in the CAAT teams had a mount with a SAW in the turret so they had a direct fire weapon if the situation warranted such.
Around the same time, during a MEUSOC workup, our company also tried changing things around within the section:
Gunners: same
Team leader: M4 with scope and 203 (identify targets more easily, cover deadspace when attached out, in addition to below)
Ammo man: M-4 (with all the weight he carries)
Squad leader/section leader: M16 with 203 (marking targets, popping illum, alternate comm signals)
Command didn't like it and didn't have the additional weapons, and optics, to make it happen.