I think flip up sights are a viable option and are often cheaper than the ole carry handles.
On ARs meant for less than 100yds I actually have a liking for old Weaver 1x scopes, but it’s getting harder to find those that haven’t started to turn cloudy.
On the AR that I posted above I’m running a Diamond(something) flip up, I forgot the actual name of it and it works just fine.
Edit:
This 6.8 ugly monstrosity is the latest gun wearing a weaver 1x, I dunno, I just like them on ARs.