I've made over 100 matches in my Spider-5K over the past days since May 21st patch.
Machine guns are hitscan weapons, the same principle as laser weapons. They should hit where you aim, minus the spread and contrary to visual effects, machine guns don't require leading.
However, the visuals are not correct, bullets seems to travel at 100 m/s, but they don't do damage at all.
This can be easily seen if you shoot at moving target, with leading (so the bullets will hit), no damage and no visual effect will be seen. But aiming directly at the target (just like lasers), damage will be made and visual effect will be seen (bullets glancing off the armour), however the visuals for projectiles is off, they will miss.
Think of the visuals for projectiles as tracers or range finders, they are not relevant to damage or accuracy at all.
Edited by PanzerFurrry, 29 May 2013 - 01:26 AM.