here is an example - I traded for about 8 breechblocks and got 2 firing pins with them (I have others), but the point is, that without modification, one of the firing pins would slip in easily in about a quarter (so 2) and another 2 or 3 would go in and out but with 'drag' and at least two, wouldn't work at all - and these are ALL original breechblocks.
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