For a cheap and quick solution, you could always paint the white dot yourself. That wouldn't be accurate enought for CAPS, but for a man-sized target in CQB, that would perfectly do the job.
Of course, having real glow sights would be significantly better.
EDIT: Ah, I was too long to post this. Anyway, what I did is I used model paint and I put a bit on the tip of a small allen key. When placed on the sight, it was perfectly round.
It's not the perfect solution for total darkness, but it does help in low-light conditions.
Last edited by Conker; November 9th, 2009 at 11:41..