Not sure if the extension was fake or not. I just assumed it was real, I didn't relaize they made a fake strap on. I thought it just came out of the box because it was sitting buy it and it was not in the store the last time I ordered my Glock. As far as the stock, it would compact a few inches and twist right and left. I can't be sure if it would stay in the vertical position, and I didn't think it would fully collapse. I don't think this store would knowingly sell restricted items because they had an LEO beta C mag for $259 that had the words LEO only in gigantic capital letters on the oustside. Tango-down, it was in a shop in southern IL, but I know a guy in carpentersville -RGUNS (www.rguns.net I think) sells the M4s also, so maybe he could get you what you are looking for there.