I do not know how Colt makes their bolts so I am making assumptions - but it would be too expensive for them to test each bolt for each dimension on the manufacturing drawing. They would have to CMM each bolt - and that takes a while - so the normal thing to do is a statistical sampling on a CMM. Then there would be gauge points and an inspection drawing for the most common areas, so some or all of those areas would be checked for each one.



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