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Old December 12, 2012, 12:02 PM   #2
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Join Date: September 19, 2008
Posts: 4,678
AFAIK, the US Gov't didn't proof, nor proofmark, rifles or barrels - the Ordnance Bomb stamp/mark is an acceptance stamp.

Arsenal rebuilds used (then) new barrels (say, one made during "9-43") on whatever receiver they were rebuilding, stamping them with the particular arsenal's ID.

I would presume each one was checked/adjusted for correct headspace, function-tested & test fired prior to re-issuing - but IDK about any such "proof firing" or "proof loads" used.

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