If it measures .67 , I would ask if it is damaged. 5/8-24 is very common for threads on a 30 cal barrel. 5/8 threads will never be larger than 5/8. .625
If it measures .67 , I would ask if it is damaged. 5/8-24 is very common for threads on a 30 cal barrel. 5/8 threads will never be larger than 5/8. .625
The Dunning-Kruger effect is alive and well.
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