Check the mod priority guide:
https://docs.google.com/spreadsheets/d/1ty239kyJbBs1sLhTo1JvSWuN0mIJsK1nwVdI6OLLtXo/view?rm=minimalBeing the first successful Assault Rifle in history, StG44 deserves so much, but sadly got so little. Like with G3, StG44 MOD is not a terrible upgrade, but it is one that won’t convince anyone that doesn’t already love her to give her another glance.
Her new Skill 2,
Firestorm, sounds a lot more powerful on paper than it actually is in practice. Her raw grenade damage is increased by 20% and there will be 3 secondary explosions after the initial, each one occupying a different radius of her HE grenade splash damage. Enemies can be hit by multiple of these secondary explosions, but when this occurs, the damage is often less than expected thanks to how linksplash damage works. StG44 MOD still deals passable grenade damage in most cases, but she is forced to compete with other AR grenadiers like 416 with a terrible 8 second initial cooldown.
The core problem of High-Explosive Grenades is that they are just so utterly dreadful that this doesn’t make them anywhere close to competitive, especially with the high HP, low dummy link enemies that are far more prevalent nowadays. StG44's overall damage as a grenadier is going to be low: in cases where you’d want a grenadier, her DPS will be comparable to just using an ordinary self buffer. Honestly kinda sad to think about.
As a fun side note, StG44 does get a slightly interesting change to her tiles. She now also buffs ARs and gains extra tiles similar to what Ribeyrolles has. The problem here is that she is hardly a support AR, since her tiles buff Accuracy and Evasion. The stat boost StG44 gets from the Neural Upgrade is relatively good, gaining a decent chunk of Damage and Rate of Fire.
As with pretty much all dolls in this tier, StG44’s biggest selling point is just the art, which IMO is some of the best art that Neural Upgrades has to offer. She will actually be the first and likely only doll in No Priority that I will personally oath and raise to MOD3. For anyone who doesn’t already love StG44 like myself, there won’t be anything worthwhile found in her upgrade.