after shopping around the internet for about 5 weeks I am very suspicious of one's ability to pay so little nowadays.
Agreed. And there seems to be somewhat of a shortage for some of the components necessary to assemble it.
You want a decent AR-15 for the money....get a Smith & Wesson M&P15 Sport. An accurate and reliable shooter with plenty of opportunities to add to it later on, if that is the direction you want to go.