To answer your question, TAPCO makes a five pack of various different sight post colors. And it is available through multiple retailers. The existing sight post is removed with the little black tool found in the bag your chamber lock came in. You can then replace it with the color that best...
To answer on of your original questions, brett248vista and polockexpress, have some excellent YouTube videos on the 15-22. Lots of mods and product reviews. Definitely worth checking out.