The Honor Defense Honor Guard uses Glock 43 sights, but rear sight fitment might be loose in the dovetail.
Glock rear sight dovetails are cut in a bow-tie manner, with the center narrower than the edges. XS' sights are designed to the minimum spec. Honor Defense cuts to the maximum spec. Due to this difference, XS Sights might not have any friction fit and might seem to slip through dovetail. To install, follow instructions and be liberal with the red threadlocking compound provided.