[MultipleParadox]

I was in the same boat not so long ago, and haven't fielded mine just yet (2 days to go!);

According to my "research", I resumed my options to be mainly between VFC and King Arms. I ended up buying a KA M4, from a great retailer on this site. So far the quality is simply great. Metal seems to be some aluminium alloy, rails are CNC'd and look great, nice trademarks to it too.

Internal quality seem "basic" but of good to great quality (for stock internals).

I didn't consider the other brands mentioned here mainly because I was under the impressions (I couldn't compare), from said research, that they either had less good internals or externals, or the price wasn't justified. I had a brand new AEG, full metal, working great for just under 500$

Just wanted to put you in perspective that there's more options. Hope it helps