I was looking at those and they look might fine!
$269 is a good deal. Also, it seems to me that just with replacing the fire control group on one of those wtih a US made one the rifle becomes a post-ban US rifle.
eg: The import parts would be:
Barrel, Foregrip, Reciever, Magazine Body, Plate and Follower, Piston, Bolt Carrier and Bolt, and Buttstock = 10 parts. (If there's a muzzle break, it would have to be US made)
Thus you could replace any of the furniture or whatever and be legal. More specifically, you could conver it to take high capacity magazines and also be legal (since its now a US made Rifle). That conversion is probably jsut adding a feed ramp like the people who convert Saigas do.
$269 + $40 for an FCG and $2 for a piece of pipe to make a feed ramp is a great deal.