I think they'll ask you if the pistols cycle real ammunition fine. When you say "yes", I suspect they'll tell you that there is nothing wrong with your guns. Your pistols are designed to cycle brass-cased ammunition, not snap caps. While exploring the reason why the snap caps do not extract may be an interesting endeavor, it does not indicate that your pistols have "extraction problems" IMO. Don't blame the guns until they fail to extract real brass cases.