Galil is a self-buffing AR, with her Skill increasing her Accuracy.

ARs have been powercrept repeatedly over the years, the use cases for ARs have shrunk, and almost every AR that does not have a strong Mod is not worth using. Buffing Accuracy is terrible compared to Damage or Rate of Fire. As such, Galil is not recommended for use.

Check the mod priority guide: https://docs.google.com/spreadsheets/d/1ty239kyJbBs1sLhTo1JvSWuN0mIJsK1nwVdI6OLLtXo/view?rm=minimal

There was initially a lot of buzz in the air about Galil MOD, at least within my circle. We thought “Wow, any AR can now be AS Val!”, but we were short sighted and not considering the whole picture. Now on paper, Galil should actually enable ARs to use VFLs at night much like AS Val can. But within the current GFL meta, Galil MOD doesn’t have any major value to speak of.

Her new Skill 2, Eagle Eye Awakening, primarily aims to capitalize on her otherwise useless Skill 1. First, when her Accuracy is higher than the enemy Evasion, 20% of the Accuracy value over Evasion will be added as Crit Rate. This will barely benefit her for day fighting, but at night will let her Crit more consistently with a PEQ equipped.
The more interesting part though is she will give 10% of her own Accuracy to any AR or SMG on her tiles, at the cost of herself losing 20% Accuracy. While Galil’s Skill 1 is active at night and she has a PEQ equipped, she’ll be handing off a decent chunk of Accuracy to her AR teammates, thus enabling them to have good Accuracy at night even with a VFL.

Sounds great right? Well, not really actually. In practice, this is little more than a fun gimmick that doesn’t really help all that much. The Accuracy increase is hardly comparable to AS Val, who gets surehit shots.
Galil MOD is a fun cutie, but she’s nothing more. Basically just a gimmick to mess around with when everything else is said and done. Outside of love for Galil, and I know Galil has her few fans, there is basically no reason to do her upgrade.

Galil is already not really useful, and giving her a little bit of Crit Damage scaling doesn't change much unless you stack it ridicilously high, which is both incredibly impractical and completely useless. Even if you do manage to do this, Galil is likely the only Doll in the entire Echelon now capable of dealing damage, and she's just not very good at it. Low RoF, extreme overkill issues, complete inability to deal with Armor (Crit Damage is calculated after Armor), and an extremely low uptime of the various buffs required to make this kind of stacking possible. Outside of memery, this is just not useful.
While it is technically possible to put her in pos4 (replacing Ribeyrolles, a much better support AR) and allowing your other ARs to get their Accuracy from Galil for Night, this is in practice, just stupid and a waste of time.
The Desert Fairy interaction gives her 20% more stats, not bad but also not really useful, as you have to use Desert Fairy.

Just use Ribey instead and leave Galil where she belongs: Logistics (or the scrap pile).