I try to find a place to report this but only here. This guy on ebay sells a lot of magpul parts cheap and I think they are fake because they are less than they can be bought for.

http://www.ebay.com/sch/helpveterans/m.html?item=301102106448&pt=LH_DefaultDomain_0&hash=item***b158750&rt=nc&_trksid=p2047675.l2562