Slufoot, I too have a Handi in 45-70 and have taken several nice whitetails with it and my handloads. Though I have just used the factory sights, i've contemplated putting on the Williams peep. Were you able to still use the factory front sight that came with your Handi with the Williams peep ? Many have said that a higher front sight must be used. Also, after you sighted in the peep, did you have to remove the factory rear sight & if so, any difficulty ? Thanks...