Sounds like a factory-fitted set of extra barrels. Someone here can tell you definitively, but I seem to remember that an extra set of barrels for a Parker would cost 1/2 the price of the gun. To save money, a set of lower grade barrels could be requested, so Vulcan barrels would cost 1/2 the price of a VH instead of 1/2 the price of a DH for Titanic. On the other hand, there may be a few DHs that left the factory with Vulcan barrels originally.
Jim
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