Lot of good answers here. I don't like heat if the finish on the stock is anything with polymers as the heat can mess up your finish. Water works well for some glues, but generally if a glue is water soluble it wouldn't be a wise choice for a glue on pad as enough rain on a hunt and it would fall off. Acetone will melt most finishes except for poly (high gloss weatherby's style)
Best way is to cut it off with a tablesaw, or belt sand it off, so that way you can keep it square. Most effective on a budget but higher risk is a very sharp chisel and just carve it off and lightly sand the remaining,
If the maker can't do it for you, or you don't feel comfortable doing it yourself, private message me. I've got a full professional wood shop and I can cut it off very precisely for you at no charge except for you pay shipping both ways.