If it's not clear by now, AR team is pretty good. has the weakest grenade of the 3 major grenadier ARs (FAL/416/Herself), except she's the best actual AR and will outDPS FAL and 416 in direct fire due to good stats and having the same accessory/stat layout as AR15. Less desirable now that G11 and such are out, but still definitely not terrible as far as grenadiers go. Will not perform to the level of a proper direct fire AR though.

Problem is, grenadiers aren't terribly useful currently outside of some gigabrain ranking echelons. I say that because I'm covering my bases here. Never count grenades out.

You can find her mod here

The cinnamon roll heroine. One of three ARs that buffs other ARs. A decent DPS who buffs other DPS. Later upgrades into a fucking metal gear. Which you should 150% get. So regardless of how good she is now, raise her anyways.

You can find her mod here

AKA ST AR-15, aka Star-chan. High stats, two accessory slots, and Unique Ammo (that you need to farm for) that outperforms regular HV ammo and doesn't require forever to build up. While not considered as OP as she once was, she remains a good unit to raise; if you partially raise her, she basically hits close to RoF cap on her own.

Her mod (and her equipment set) brings her back up to a decent spot as an AR. You can see her mod here

"Are you THAT short on ARs or need cheap equipment that badly?"

You get much better ARs from story events, and there's only so much that you actually need. If you need a cheap AR and already have FNC though I guess she can be useful.

Her exclusive, while it does give her more strength, doesn't let her outperform many 4* ARs.

Choco tabemase? You get her for free and she performs OK. Has a long history of suffering in the game and may suffer from PTSD. Damage bonuses are nice, and she's just strong enough to take down a Jupiter cannon by herself, provided you have some cannon fodder between her and the Jupiter (which is mostly why she has PTSD).

She used to perform really well, and she does perform OK for cost to raise, but a 5-star and 3-star AR cost the same to actually use, and the newer ARs are much, much shinier. She's still OK but don't get too attached, you'll have better soon enough. Maybe she'll get a mod someday.