Do yourself a favor with the 642: get the Crimson Trace laser grip. You don't have to buy it that way, the grip can be ordered via Midway and a host of other places. The 642's sights, to be highly technical, SUCK. It is a concealment gun, meaning that the sights are very low to the gun, and the sight radius is very short. Plus, the only time you're likely to use it will be in conditions of low or no light - and if you ever need to use it, you'll realize that the CT is worth its weight in diamonds.
The 642's sights, to be highly technical, SUCK.LOL, that's what I would do if I were to get a 642 – aside of the issue of getting ammo for it.
I have a chief’s special right now in my pocket. Buts it has that hammer on it and a 642 doesnt have the sharp edges..Youre right on the money about the crimson trace sights. Ive been thinking of putting them on my glock 19 for some time now.