The iron sight Balista is the only sniper I use in this game. So bad it is awesome.
Pro tip is to aim high. If you aim at the chest it will typically hit low causing a hit marker. If you aim for the neck you usually hit in the upper chest and get the kill. Aiming for the head, you need to have the head actually below the center post of the sight.
"Cover your receptors Perceptor." Driver picks the music. Shotgun shuts his cakehole.