I bought snap caps, then dummy rounds with rubber/plastic-like inserts (I have this feeling that the primers on snapcaps get dented and lose their buffering ability whereas the polymer material used in dummy rounds seems to hold up better).
Maybe ideally it would be to use dummy rounds with polymer primers 'and' the oring.
This way you get the weight of real bullets, can practice tap-rack-bangs with seemingly more realistic feedback, and the o-ring gives additional 'protection'.
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