I'm a total newby too, so take what I say with a grain of salt.
You really won't know what you'll get until you get it. I just got one of the kits w/barrel from them. Black upper, black charging handle, modern unused A2 slip ring. Not what I was expecting. But it's surplus, and you kinda get whatever you get.
Barrel I got was 1:8 with the FSB installed, pinned sorta funky. Looks like when the gas port got drilled it wasn't cleaned up at all cos I see some material in barrel in that spot. The barrel was dangling outta the box when delivered, they jammed it in and it broke through.
Some parts may be filthy, and some may be newer and relatively clean. I would advise a thorough cleaning and inspection of every single part. I strip the upper first thing and wash that in the sink with soap, hot water, and a toothbrush. I use rubbing alcohol to clean the furniture. Everything else gets cleaned with Hoppes then oiled with CLP.