Blueprinting....Measuring to a millionth of an inch

bluedog69

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Joined
May 25, 2021
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907
Location
USA
I am new to this forum. Been reading on here off an on for years, finally broke down and joined.
If this has been posted on here before sorry for the repost. The title of this is somewhat misleading
it is about guns and not just being a metrologist.(a guy that measures for a living)

Hexagon barrels...the inside! not the outside.:eek:

Enjoy.
 
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