The new Magpul MBUS Gen 3 polymer sights require a unique sight post that is different from the MBUS PRO sight posts.  We are making several designs for these which will be released in the Fall of 2023.  They will be on our website in their own Category under Firearm Sights.  These will include both painted and tritium models.  ETA on these is late Oct 2023 time frame.