Dave Suponski suggests it is an indication that that particular barrel is over bored. Some guns have just one barrel with the + stamp while other guns might have both barrels so marked.... and then there are the multitudes of Parkers without these stamps at all. Dave tells us also that upon measuring these barrels so stamped that they are indeed over bored or have bore sizes greater than the standard or nominal ID for the gauge.
But we have no empirical evidence that this theory is fact.
.
__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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