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#26 |
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Twice a Lifer
Lifetime Forum Patron Join Date: Mar 2011
Location: Atop the highest hill in Schuyler County NY
Posts: 3,403
Thanks: 7,572
Thanked 2,651 Times in 1,395 Posts
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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.
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