a rebounding lock keeps the hammer from resting on the striker/firing pin, a non rebounding needs to be put on half cock.
putting a barrel on face should not have any affect there.
are the firing pin protruding the breech face when at rest?
did you check the springs around the firing pins- they should hold them back a little, if they are not there I guess the firing pin could go forward by that little bit of room the springs would have filled.
or - is there wear to the the rim area - head space allowing the right round to recoil against the firing pin
just guessing with out the gun in hand
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