AR sight help.

I'm finishing out an AR15 with sights finally. I want to co witness the iron sights and red dot but not quite sure which type of front sight to look for. The rifle has the classic A shaped front sight gas block. I was looking for an inexpensive metal flip up. Don't really want to change the gas block and go flat top just yet. Mainly I'm looking for what search criteria to use when searching for the rear sight. I'm kind of hoping to keep it under $25 if that's reasonable.

Thanks

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AR sight help.