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Happy Camper
7,794 Posts
The gas ports on the barrels:

The 7.62x39 is almost exactly 11/64" diameter... the same as a #16 drill bit - .177".

The 5.45x39 barrel's port is very close to 5/64" diameter in the barrel. Update: the size is 0.076" diameter, same as a #48 drill bit. 5.56 should be about the same.

- Jerry
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