A Designated marksman rifle or DMR is a selective fire rifle that fills the range gap between an assault rifle and a sniper rifle.
Here is an example of one.
With 2.0 on the way and the support class only having SRs, I believe a new weapon class should be added to make up for the changes. This would fill the weapon gap that I believe the support class is missing. It would allow the support class to be closer to the fight and still deal some damage.
Damage wise, it would be weaker than a SR but a little bit stronger than a AR, adding a large 20 round mag and red dot sights could compensate for the lower damage.
The idea is a work in progress but I think it has potential.
I'll add more to this as time goes on.