A standard pencil is introduced to the muzzle, and if it slips easily to the bottom, it's 9 mm. If it does not go, it's a 7.65 mm.
Sort of but with caveats..
The wooden pencil shaft will go into a .30 bore BUT the metal ferrel on the erasure end will NOT fit in a .30... but WILL fit into a 9MM.
So just to be sure it is the METAL erasure ferrel that is the true measurement.
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Jerry Burney
11491 S. Guadalupe Drive
Yuma AZ 85367-6182
l ugerholsterrepair@earthlink.net
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