It is available in two configurations, like mine and with that HUGE optical thing that FN thinks is cool. I really dislike being forced into using an optic that I don't like, so I opted for the flat top. I think the factory optic makes it look goofy and a whole lot less manageable. Some people like them, but I am not one of those people. To me a CQB bull-pup design needs to be small. That gun is crazy accurate for what it is and I am throughly convinced a good shooter can out shoot the factory optic on it.