About dry-firing... Id say do it till your hearts content... And then do it some more. The only thing about the xd is the striker hits the striker retainer pin (the small hole in the top of the slide). Eventually they wear out, something like 1 in 10,000 (don't quote me on that.) Snap caps are a good way to keep that from happening but those split pins or aftermarket roll pins aren't very expensive and pretty straight forward/ easy to replace.
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