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Any chance of posting a photo of your rail and XS sight set-up?
I've been looking for something along that line, that will allow my to set a longer eye relief scope further ahead on a Marlin GBL I acquired a short while ago. I need a little more distance than what there is available now, but, that's the way it came. I see one in the Brownells catalogue, a Marlin 1895 Rail Sight System that appears to be what I have in mind.
Williams FP-336 sights on my "new to me" 1895. Great sights. Was considering the XS with Rail but I didn't see the need after using the williams for a while now.