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If to hit rolls must still be rolled, what is the advantage over the Artemis IV?
+2 instead of +1, and you only need to swap the ammo on the launch vehicles, not find an extra ton on every unit for each launcher.
NARC can seem like a pretty hefty investment, but if you've got a heavy lance of missile carriers sitting back at range like they should be, being able to just swap in an ammo type and give one of your scouts a NARC unit is a lot simpler.
What's easier? Refitting 4 catapults in your fire support lance with 8 Artemis systems reducing either their ammo or fallback weapons, or adding a Raven to your scout lance and buying some fancy ammo for the Cats?
Remember, you need a dedicates Artemis system for EVERY launcher you want to get the bonus and it's only good for that ONE unit's ONE launcher.
You only need one NARC beacon for your entire lance/company/battalion/regiment to share. Remember, NARC gives the bonus to ALL friendly units on the struck target until end of play if they have the right ammo type without having to modify those other 'Mechs!
... and if memory serves, NARC also applies its bonus for indirect fire; Artemis being point and shoot doesn't.