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Old 11-16-2012, 13:37   #3
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Join Date: Aug 2004
Location: IL
Posts: 932
Without seeing it in person, I would say a machining mark.

Many of the old guns look like they where chiseled out with a hammer & punch.

Try and Google some images of older breechface Glocks they are rough, no problems mechanically but looked rough.

Again just a guess..........

Last edited by mongo356; 11-16-2012 at 13:37..
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