FormerlyHemlock
Hero
That's not a very wise course, though. Magic weapon is neither Evocation nor Abjuration, meaning it would be a spell that's one of the three (20th level doesn't count... 14th barely does) valuable "any school" spells. Yes, you're almost certainly going to burn all three spells on the Transmutation school, just like the Arcane Trickster, but magic weapon strikes me as a very weak choice. Additionally, you're not getting 2nd level spells until level 7. Sure, sure, "Magic items aren't required," but I'd still argue that your campaign is a little abnormal if you're a level 7+ Fighter in an archery role and haven't got at least a shortbow +1.
Tastes vary, but I can't think of a single better choice than Magic Weapon for a level 8+ Eldritch Knight archer. It has a terrific action economy, ensures that your weapon attacks do full damage against almost anything at all, lasts for a relatively long time (important since you don't have many spell slots), and synergizes well with Sharpshooter. And it doesn't require you to pump INT.
I can't think of a single spell I'd be willing to give up Magic Weapon for, on an archer chassis. On a melee chassis I could maybe see giving up Magic Weapon in favor of Blur or Enlarge, if you were very confident you'd never face any weapon-resistant enemies.
Obviously the point if moot if you own a genuine magic weapon and are confident you will never lose it.
RE: the certainty of gaining a shortbow +1 by level 7, try rolling up a few DMG treasure hoards for CR 0-10. Magic bows aren't that common. In any case, I've run 5E campaigns in which level 8-14 characters did not have magic weapons. The PCs didn't do a lot of dungeon crawling.
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