Many shooters would argue that the Glock is perfect just like it is. Its Spartan form, combined with superior engineering, should be left alone. Others go all out and modify their Glock until you can't tell what it is. Either side has a valid point. In reality, it's your gun, and you can do what you want to it.
I have a long habit of engraving my last name on all of my tools. This trick works fine for my tools. However, it's not the best answer when it comes to my guns. Tyrant Designs came up with a Glock slide cover plate that does the job. Of course, physically, it does the same thing as a factory slide cover plate. However, when you slip in a Tyrant Designs Glock slide cover plate, it makes an immediate visual difference. If we get together and my slide cover plate is red, and yours is blue, it's obvious which Glock belongs to you.
There's a viable benefit to using this new Glock slide cover plate. The cover has a pair of deep chevrons machined into its rear surface. They angle upward and point right at the center of your rear sight. This texture naturally guides your eye into the perfect sight alignment. So, something as easy as installing a new slide cover plate could make you a more efficient shooter. Additionally, Tyrant Designs offer their slide cover plate in several different colors. You can stay with black, or you can dress up your Glock and color match your guns other custom touches.