Return the Devotion and the Turbocharger
The DEVs wrote that one of the reasons the Devotion was removed was the fact that the LSTAR needs to become a normal weapon and it's an energy LMG so there would be too many.
They implemented a poor weapon which nobody liked, then they went all in and removed a weapon which some people (like myself) really liked. This is the kind of logic I can't stand. If your weapon design is bad, don't keep shoving it down our throats, but either remove it or improve upon it.
The second reason was that a fully kitted Devotion may be overpowered (or so they claimed). Very few people play with the Devotion. A lot more play with R301 instead. Now I am not saying to remove the R301, but rather to give you a clear reason why your logic is not only flawed, but stupid. The weapon was perfectly balanced and while being good with a full set of attachments, it was FAR from overpowered and had many flaws.
In addition - why remove the Turbocharger?! It was a fun and rewarding attachment. Almost nobody likes the Anvil attachment, but you keep it. The Turbo was a nice attachment which was neither easy to find, nor overpowered. Instead it helped make two decent weapons into two good ones.
There is a simple rule in football - it the game goes well, you don't switch players. The same goes here. The weapon and the attachment were excellent, both in terms of balance and player preference. The issue was your stupid L-STAR, which is still being used rarely due to its many flaws. So instead of messing with what works well - why not try to fix what doesn't?