Now that I'm not on a cell phone, and actually remember the manufacturer of my rifle (thanks GilpinGuy), let me expand on what I said earlier.

The factory sights are fiber optic, and work very well with a good sight picture, IMO. However, after carrying the rifle around in the woods the first year, and leaning it against trees and stuff, I must have hit the fiber optic and cracked it. This in itself would be okay, except the glue holding it in let go, and now the tube slides around. You can see in the photos that half of it has fallen out and the half remaining has an additional crack. A more enclosed sight would be more durable. I didn't take photos, but the rear sight could use some locktite as it tends to come lose after multiple firings and slide around. The year before last I was sitting in the woods and just happened to look down at my rear sight and saw that it has move about 5 notches on the elevation. Fortunately I had remembered where I had set it and could slide it back. The screw starts to round off before you can get it very tight. More robust sights and I wouldn't even look at another rifle (not for the distances that we shoot here anyway). All that said, I took down a decent buck (my first ever) last year with the sights as you see them in the picture.