ProtoAvatar wrote:

Federation forcefields are immediately effective against both directed energy weapons and projectiles. And we have yet to see an "individual" forcefield. Perhaps because the energy consumption is too big?
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Worf is able to modify a com-badge into a force field in A Fist Full of Data's which lasts long enough to stop him being shot.
The Borg should come complete with a kevlar style bullet proofing included in their armour, and if they don't their nanites should be able to give them such a coating after the collective gets shot at a few times.
Trek changes how it's tech works from episode to episode making it impossible to work out why things are the way they are.