Magpul is an AWESOME company, and I know for a fact that if they have one anywhere in their facility they will dig it out and take care of you.
I managed to royally fuck up a stock body by baking it at 300 degrees for an hour and they replaced it for me without question and without hesitation. Hell, I called them up to ask about BUYING a replacement, but they sent me one for FREE. The only catch was that they wanted me to send mine back so they could look it over and possibly come up with improvements. They even sent a postage paid label so I was out literally ZERO dollars, and all for something that I fucked up.