I sent my Glock 19 slide to Glock July 29th to have them install night sights and should have the slide back to me August 8th. Total cost....$61.33 to my door. That just seems like a really good deal to me. I know there may be better sights out there, but the Glock NS are pretty good. I have read that they are Meprolights. Anyway, for $57 plus tax I didn't think I could go wrong.