There are a few great night sights for the Glock models.
XS sights, Novak sights, Warren(I'd get the Operator type), Trijicon HD(orange & green).
See
www.Glockstore.com www.brownells.com www.bowietacticalconcepts.com www.novaksights.com www.glockbooks.com .
Gunsmith and SWAT cop, David Bowie of Ohio can install the Warren sights.
Wayne Novak is a highly respected pistolsmith & makes tritium sights.
The HD line may be worth a look but many armed professionals like the XS & Warren sights too.