take it for what it's worth....but I would buy a complete factory assembled AR from RRA, BUSHMASTER, or ARMALITE...COLT if you want to spend a couple hundred bucks extra just for the name.
this way you will get a warranty with the rifle...in the case of ARMALITE lifetime to the original owner....if you go the "piece together" option, you will have to get it fixed out of your own pocket, if something does go wrong with it.
whatever you decide....DO NOT, and I can't stress this enough, DO NOT BUY ANYTHING FROM HESSE or VULCAN ARMS as they call themselves now....OR AMERICAN SPIRT ARMS (ASA). of all the AR manufactures, they are the 2 of the worst pieces of shit "firearms" that was ever produced on the American gun market....I would rank them even lower the HI-POINT, or LORCIN