I recently purchased a Caracal C 9mm. I've seen lots of pictures of Caracals online and have noticed that there are many different variants. For example the quick sight option. My question is, are these different variants interchangeable? Can I go get a quick sight slide and swap it out with mine? I've also noticed further variations even within the QS option. I'd like to eventually have one similar to this. Though I'd probably want to replace red with green.