both my pre cerberus 1894 and my brother in laws marlington 1895 have the XS peep sights, the front sight on mine had issues when they mounted it but that was easily rectified...just a pain to deal with, his never had issues, I exploded a tweety bird with the peeps on his the first time I shot it and vaporized a chipmunk with mine the first time I shot it...
...I would say they offer decent accuracy overall.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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