Presume you know that Twist barrels are not appropriate for a Grade 3 Parker.
If it is strictly intended for an extra set of barrels for a shooter with no intent to recuperate your investment then, why not - go ahead.
If the donor barrels have some choke and show minimal pitting or 'frosting' I would say they haven't been honed and should be 'good to go.' There are barrels out there that have "mirror bores" that really need to be measured. By your description the donor barrels may be okay but should still be looked at, if not measured, by someone who knows what to look for. "Normal" or even 'acceptable' are very subjective. It is pretty 'normal' to see pitting in barrels of this age but the subjective part is 'How much pitting' and 'How deep are the pits.' Another thing to look for is evidence of repaired dents and if they were honed smooth on the inside.
Regarding the "ring", good composite barrels should yield a nice 'gong' but not so much a ring. In my experience, fluid steel barrels will yield a nice 'ring.'
What you don't want to hear when you tap the barrels (when they are suspended by the hook) is a "thunk" or a "gong" accompanied by a noticeable 'buzz.'
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__________________
"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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