If you have the $$$ & time...
A laser-aimer or a white light could be a good add-on; Crimsontrace offers a free DVD(2013) & Lasermax, Insight have cool green laser-aimers.
They are not cheap, but they could help with protection or with training.
See: www.policehq.com www.crimsontrace.com www.lasermax.com
Know too, that there are pistol/white light holsters out there.