In my experience Gun Parts Corp (aka Numrich) is a crap shoot.
You might get a new part, a used part, a wore out part, or a reproduction part from who knows where. Coincidently to this thread, I just recieved 3 parts from them this week. One was new and exactly what it should have been. The other was a pair of "new" factory grip panels that not only didn't even come close to fitting the frame of my gun, but had screw holes that were off from where they should have been by a full 1/4". I'll give them this much though, the grips were in fact, new...and did kinda-sorta resemble the factory grips.
But that's not too bad though, because Gun Parts Corp is so used to getting returns that they automaticaly include a return slip with your order. You aint even gotta contact 'em first, just send the crap back.... Now, is that "after the sale service" or what?:lol: .
I too have had mixed results with them in similar ways. The thing you have to remember is that this is more than likely the result of how they get the parts from the manufacture. I would imagine that most of the time they parts are organized and numbered properly, but i would also guess that there is a BUNCH of parts miss-matched and just thrown in the bin.