Note: A third option for the RM Hawken is Boomerang's rear tang site that he custom makes - in the event some of you are familiar with his site. He even offered to thread the aperture so I could use Williams Twilight Peeps!
Check out RMC-Oz Yoke they make aluminum sights front and rear, the rear had either a closed peep and open v- peep, I have them both, and really like them, one is on my squirrel rifle the v-peep and the closed peep on my deer rifle. the front sight has fiber optic, couldn't use rear sights with fiber optic with my over 50 yr. old eyes !