No point in trying to compare your rifle to a CMPicon Correct Grade; the value is based on originality & condition. Your rifle is a rebuilt mixed parts rifle, & has been altered; as you were advised, value is strictly as a "shooter". Arlington Ordinance was one of the better importers; their rifles came from the Korean Army (which used & badly abused many rifles), but Arl Ord actually evaluated their rifles & often made repairs.

Value of a shooter would be largely based on condition of the bore. Replacement USGI barrels are virtually nonexistent, but even commercial barrels aren't cheap by the time you pay for labor. Anyone knowledgeable would want a Muzzle Wear measurement. A single round of USGI M2 ball, inserted point first in the muzzle, will let you know how worn the muzzle is, based on how much copper jacket shows.

Neal