UPDATE:
After playing a game or two with these guys, I've discovered a bit of an issue with using RL ammunition and how theorycrafting the idea worked VS the tabletop experience. This gives way to some Handheld Weapons Options:
For the Magpies:
Arrowheads (LRM5, 1Ton ammo, no armor) {Meant to allow harrasment as the mech closes the distance, and can be dropped once in proper range for the rest of its loadout.}
For the Dire Hawks:
Heavy Arrows (x2 LRM-5s, 1 Ton Ammo, no armor) {Similar concept as the Arrowheads, only using an additional LRM-5 for heavier firepower)