My R357S (357 rifle) came with lamo plastic rear sights good only for windage, no elevation, piece of crapola. I replaced the rear sight with one from a T/C Contender I bought on eBay for $5, screwed right in to existing holes for scope base. Williams makes an excellent peep site for the T/C Contender that i'm sure would work. I haven't found a replacement front sight yet but the Contender rear sight works fine for now with the factory front sight. Hope that helps.