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As for the claimed 'shadows' of lands showing outside the barrel and the like: Do this with enough force and you will see the claimed OSR shadows on the outside of the barrel. They are simply stretch-marks alternating with stronger sections of the barrel. Hence the visible lands / grooves pattern.
I've wondered about this for a long time, namely; Is it truly the lands pressed out, or, rather the weak part of the barrel in the grooves that is "giving way". I suspect it is the latter. Not sure.
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