Well since this is brought back up...
Dryfiring causes piston slam, since there is no resistance in the barrel, the piston slams forward much faster. A plug on the barrel should provide enough resistance, perhaps even too much, so a tiny pinhole in the plug might be in order. Not to be confused with the blank firing attachments on real steel guns (required for the gas pressure to operate the piston, on gas operated automatics).
Cheers,
Alex
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