SP101 night sights.
I have the xs small dot on my 3 inch sp101. Liked it so much i got one on the wat for my 2 inch sp101. I havent seen a big dot in person, but the smaller one was great both daytime and nighttime, i decided it was a great choice for my 2 inch carry.
I wish you could get back sights also, but hey. It is a great little revolver, in fact my favorite, and i think at close range in the dark, front glow sight is better than nothing!