Not that it has any collector value now, but one day it might and there are a lot better waterfowl guages than 16. So why do you want to Paint the gun ? My younger brother and I both started with single barrelled guns. Mine was a Savage 94 in 12 Ga. and his was a 94 in 16 Ga. Both guns were used a lot for "rough shooting". I still have my old Savage but his gun got away from him and I know he wishes to have it back. If you just have to cover the gun, why not use some camo tape ?
Act in haste, repent at leisure.
Best,
Harry