Although Mk17 is categorized as a standard rifle in The Division 2, many players simply call it the "Cannon". It has a rather low firerate, but the damage output is so high that you don't need to shoot too fast, really.
Another cool feature of Mk17 is almost a complete lack of recoil, which makes it very accurate by definition. On top of that, this weapon doesn't care about the range. It takes care of targets at close, mid, and long ranges equally effectively.
So, if you're looking for a precise weapon with high DPS, then military variant of Mk17 would be an excellent choice.