The chrome parts will definitely affect resale. Many collectors want the rifle to be as original as possible. That said, I have seen a couple of chromed WW2 German pistols sell for pretty good money on auctions sites. Did your grandfather serve in Germanyicon? I was recently reading (while researching the aforementioned pistols) that it was very easy and very cheap for American GIs to have guns chromed there after the war. If it were mine, I would keep it and continue to pass it along so your grandfather's service to our country will not be forgotten. Hope that helps!