These all have the synergy EGO Precision
[1]-10% accuracy
[2]-20% accuracy
[3]+3% active EGO ability duration on critical kill
[4]+6% active EGO ability duration on critical kill

Level 3:

-Dispersion Muzzle 3
Attachable to rocket launchers
Full damage radius: +0.60

-Fast Action Reloader 3
Attachable to Assault Rifles, SMGs, and LMGs
Reload: x0.85

-High Capacity Magazine 3
Attachable to Assault Rifles, SMGs, and LMGs
Mag: x1.50