A captured weapon is not necessarily a battlefield pick-up? If you are an invading Army and capture a weapon from an individual soldier, Arms Depot or Factory it is still captured is it not?
Yes it is captured, but unless it's captured on a battlefield, it's not a battlefield pick-up.
A lot of emotion here on this subject, so I guess I risk some outbursts by responding and keeping this going, but I think it's worthwhile to learn about the history behind the "Russian Capture" (Soviet Capture really) Mausers. Sorry to say this, but not all RC's were seized from the hands of a German soldier who had several kills registered with the rifle - and there's no way to know.
My thoughts:
1. This is the "Milsurp" Forum, so shouldn't we expect that there would be opinions other than "great job" when someone alters a gun?
2. It's your property and no-one cares what you do with your property and yes it is your right. Some people like to advise against it, as it will almost always reduce its value. Most people appreciate the heads-up and often then look for an already altered (and cheaper) gun to modify the way they want;
3. You really can't restore an RC back to its original condition, unless you find the original bolt without electropencilling, the stock was not belt sanded and marked, the receiver was not peened, etc. It'll always be an RC; and
4. I agree that the RC's look much better with stripped and re-finished stocks, and missing cleaning rods installed. I might do it myself some day, but I'll do it with open eyes and won't try to pass it off as a Bring-back. They can be great shooters.