If you're going to dry fire a fair amount, use a snap cap (purchased or homemade). Dry firing does damage either the slide or firing pin overtime. It is easy to find pictures of Glocks with failed breechfaces and HK revamped the USP firing pin because of dry firing breakages.
If you're cheap, a shell casing with a piece of leather jammed into the primer pocket will work, but may take some fussing to chamber on tilting barrel action.
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