The heat was not even great enough to blister the polyurethane stock finish, so there should be no real damage. The rust appears to be due to water damage, not heat. First thing, use some spray oil or penetrant (I like G96 Gun Treatment for jobs like this) on the steel where there is rust, then if you know how, remove the stocks so wet wood does not cause more rust.
If you don't know how to detail strip and clean those guns, a gunsmith is the best idea, but make sure he will be able to tackle the job right away before any more damage can take place.
Good luck.
Jim
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