So iv been experimenting with snipers recently (I mostly play coop) and made a Mk12 SPR esque build. This to me seems like the best of both worlds.
2x red dot (though I keep an extra point for the SU230)
This allows me to put little holes in heads at extended range and fast follow up shots without taking away from my room clearing ability.
I realised while playing that the G3 would be excellent in this roll.
Whats nice is that this is a build almost any class can make since the 7x scope is next to useless seeing as the zoom is far far too much for any map in this game.