If it has a broken stock that makes in un usable now, then it should be replaced. Either with a new one, or a sound original replacement.
Making the gun a sound shooter will surely improve the value. However, a poorly fitted or repaired stock will not make it worth as much as it could be.
Granted, if the gun is in average condition, a well crafted new replacement stock would not make the gun worth more than the repairs would cost. But it would be a proper repair and restore the functionality of the gun as well as the overall value.
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B. Dudley
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