The short answer is that we would have to know the condition of the original barrels and what prompted their replacement.

This is sort of an apples to oranges question. If the object is to compare to a similar gun which has the original barrels, then the Wild tubes on your A&N may or may not shave something off the comparative value of your gun. If the new barrels compare favorably in every way to the originals, the gun is in proof, etc. then little value is likely lost for this particular gun. The equation changes depending on the name on the gun, its overall condition and the quality of the new barrels of course.