Brownell's and a host of others are now carrying the fiber optic front site called the HI VIZ. It has two colors and three different diameter pipes to choose. Colors are Neon Red and Neon Green. They are bright and gather light very well. The cost is about that of the ragged hole and requires no gunsmithing as it is literally remove and replace. I suggest removing the stock sight and degreasing and then using Red Loctite.
I think you will find sight acquisition with the combination to be fat superior to any thing this side of a Red Dot. Good luck and have fun!
