Visual aids help aim considerably. Three points I'll have to adjust for are :
- Night vision
- Laser dots
- Tracer bullets
Night vision makes it easier for your character to see movement, pin point the enemy and thus aim. There is a reason why it's not permitted to export advanced optics from the US; not letting enemy troops have such an advantage. Being in the dark is a great advantage and something I under estimated in the rules.
The use of laser dots to see were your bullet will hit is also a valuable asset I failed to add modifiers for. An iron sight assault rifle should be less effective than a laser dot. Same applies for tracer bullets, although these will require a period of adjustment represented by increasing bonuses as fire is adjusted to the target.
- night combat will suffer penalties mitigated by night vision
- advanced sights will add aiming benefits
- tracer bullets will add bonuses to sustained fire the longer it is kept up