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Old July 3, 2012, 03:53 PM   #4
Senior Member
Join Date: November 17, 2008
Location: NW Ohio
Posts: 1,370
Always outside the barrel. Depending on the firearm, you may or may NOT have enough thickness on the barrel to thread for an adapter.

FWIW, Adco does most 9mm's but not enough meat on the bone for .40's and .45's.

LINK HERE. See the bottom of the page.
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