Between her two modes AND a passive that helps keep shotguns alive, I don't think there's much more to say other than "she's great, you will probably find a use for her."

Like every other DPS shotgun, she really doesn’t have a place in current content. A phrase commonly used around here is “a solution in search for a problem”, but the real problem with MAG-7 is that I’m not entirely sure she’s a solution either.

Her passive effect can be very nice when enemies start having 600 armor, but the times there are less than three targets are very rare. Her active skill can make her damage go sky high if it’s allowed to stack, but her being on the frontline gives her the same issues a lot of DPS SMGs have. She’ll lose links, cutting her damage by a ton. Not to mention that it takes a little while for it to ramp up. The DR afforded to her by the skill isn’t high enough to keep her healthy enough to do much.

The Steyr ACR is the gun the Pallet Rifles in EVA are based off of, and this one is about as useful. On one hand, it seems like she'd be good for para fairy and its debuffs (you get +25% final damage with that), except it isn't enough to make up for the debuffs still. It's also not very easy to get debuffed. Evaluation may change based on future enemies, but really it's not worth it when you have so many good ARs to choose from.

Can she dethrone AS Val's ridiculously solidified position as a top-tier damage dealer? ...Not really. She suffers from wanting some base crit rate, but making use of her crit rate requires either targets with shit evasion to begin with, a ridiculously high hit rate modifier somehow, or some other means of hitting targets at night. She might have some uses, but she's harder to use than AS Val, and you don't get much in exchange for it.

Her Mod 3 unique equip is alright. It lets her punch through lighter armors, and otherwise is excellent at finishing off weakened enemies, rather than wasting full-power shots on them. This is usually a thing with rifles that don't quite instantly giblet their foes. Her tile buffs are pretty okay.

She's alright but not a priority.

An RF that was originally slated to be so good that they nerfed her before her release. Unfortunately this current incarnation is nothing special. +30% each to Crit Damage and RoF is a ballpark 65% DPS increase, +/- a bit due to RoF depending on the level yours is, assuming 100% crit rate. This is... not inspiring compared to what some other rifles you already have might put out. You can fit her on whichever style RF team if you want to use her. If you want a top end version of this, use R93, who has a better version of the gimmick.

Modded version of M14

What's there to say? Blood for the blood god, etc.

She gets bigger %s on her self buff and on Mod2 she buffs her own crit damage. You really want, if possible, to get that Oath ring on her for the extra stats at Mod3. While the new skill %s seem low, combined they pretty much exceed Lee Enfield's self-boost and part of it is a passive. It retains all her old advantages, but just embiggens the numbers a bit. Basically, she can provide IWS-level DPS (overall, not per shot) while maintaining her high (for an FP rifle) RoF, making her very efficient. Generally rated "probably 1 of the best mods to work on after you're done modding AR team" by older servers.

She has very weird mechanics. I want to say something witty but that's really how it works. The most immediately noticeable thing is that her damage is actually cut in half and she fires twice. This seems odd but no, its not just a visual thing either, and both shots actually can end up on different targets. The first shot uses normal RF targeting, while the other has real time targeting to always shoot the farthest target. Vs heavily armoured (enough that AP rounds wont go all the way through) or high HP enemies, this can be bad. Or it can be excellent at trash clear.

Also note that because she shoots twice, it only takes half as many firing cycles as it says on the skill to get stacks, as she gets 2 stacks per cycle (1 per shot). It also has interactions with Sei and Jill that are in the detailed page.