A thing to be very careful of with a poly finish is that it sits on top of the wood instead of penetrating the wood like an oil. So, if you have to remove any finish, you may be dealing with some difficulty getting the wood color to match in that spot when putting new finish on. And it also depends on if the gun has any stain or color under the poly. Many manufacturers use a heavy stain on the wood under the poly finish. This can really complicate things.
Sorry I couldn't lend more help on the matter.
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B. Dudley
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