I am a minority here, but if you really need to be covert then I favor a small PCC i.e. MP5K, mini uzi, BT TP9.

Which as pistols with a brace make perfect sense to me. Ammo is easier to carry due to smaller size. In a covert situation and in the USA, you are not going to be making shots farther than 75 meters.

I have run many a mission with such weapons and had little issues with them. Does a rifle hit harder, of course. Can you make a PCC get the job done for sure and easier to carry.