GB and rickyp are right on the money. To me, things like that have minimal value because I am a shooter, not a collector. To others, it may round out a collection and be something they've sought after for some time.
But GB, as to "If guns could still be sold on flea bay...": Technically, guns were never allowed on that site (some slipped through early on), but plenty of barrels and accessories were sold there. That's why there was such as uproar when they changed their policy to, as they so elequontly stated, "adhere to this nation's gun control policies." E-bay is run by a bunch of left-wing, PETA-type morons with an agenda -- and there's NO doubt about that.