Quote:
Originally Posted by Bastogne71
http://gigconceptsinc.com/files/STAN...ridge_9x19.pdf
This is a pdf of the Standardization Agreement for Small Arms Ammunition (9 mm Parabellum) from 15 April 1982.
They do not define what a "standard proof barrel" is so we can only guess. Maybe someone else can find that standard.
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Outstnding! They give the mechanical drawings for the proof barrel, it's several pages in. The proof barrel is 7.85 inches long. They also provide the rifling details, 0.347 bore, 0.356 groove, didn't check the tolerances.
Added material: barrel can be up to 0.011 in shorter. Bore tolerance is +0.0005 in/-0.0000 in; groove tolerance is +0.001 in/-0.0000 in. That's tight tolerance for the bore.