The Blitzkrieg Components AR-15 Chevron Front Sight Post is precision machined from billet 416 Stainless Steel to the tightest tolerances for an outstanding sight picture and precise fit in any AR-15 front sight housing. It is not designed to replace the post on flip up sights.
The Blitzkrieg AR Chevrons will only fit sights that accept standard A2 sight posts. These do not fit the Magpul Steel MBUS PRO sights. Blitzkrieg makes posts specifically for the MBUS PRO sights which are on Optics Planet.