The balls were aimed at the seller not you
Like I say most of the people I've dealt with on ebay.com are good folks and very helpful, you just need to be patient and ask around.
I now have everything for the No.4 I can get, including the magazine which are the most difficult to source, I only need the internals. I'm currently aiming on using a gas gun, that way I don't have to cut a space for the magazines to slot in. But then it comes with all the problems of a gas gun & I'll have to use the magazine as a template to make fake mags to stick to the bottom of the gas mags so it's swings & round abouts. My one will (fingers crossed) be better aesthetically at the expense of practicality & possibly performance but it comes down to what you're wanting.