TC Saddle and Wichita Silhouette sights (which have a globe front - 4 range preset open rear) used to be made specifically for the TC handguns. I had and used both in my IHMSA shooting days (still have 2 of the saddle rear open sights). The "fire" type front and rear sights have also been adapted to TC handguns. Would imagine just about any peep sight could be adapted as well, although I don't know if any are made with the standard factory screw pattern. You might have to drill and tap.