You can make a snap cap by using a .30 Luger casing, punch out the old primer and replace with a piece of hard polyurethane rubber. Glue it in place with "LiquiSole" or "LiquiSeal" made by the Elaston Company in Akron, Ohio. These ar both polyurethane rubber in a toluene solvent, the "LiquiSeal" being a lot runnier than "LiquiSole". Both take about 24 hours to harden completely. Replace the bullet, and there you go: a snap cap that you can use to check cycling and feeding function, as the snap cap has the same dimensions as a real round. I have been using these home made snap caps on many of my center fire guns for many years and have found that they last for a long time of dry firing practice with no damage to the firing pins- when the snap caps show wear, just replace the rubber or make a new one (easier to do).
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