I have they are great people there and I have ordered from them a few times. Most of my AR-15 and M4 upper parts are from them and I have never had any trouble with them.
I had to send the upper back because I did not like the railed handgaurd that ran along the top of the recever so I sent it back with the YHM free floating handgurd and it was fixed out sent back to me with no trouble and gave me credit (I quickly spent that) on the lower cost of the YHM one. I talked on the phone with them are there very nice and take time with you. I recomend them to everyone that wants AR parts.
If you dont want to assemble the gun you can buy a complete lower from several people like SARCO for 200 bucks and then just buy the upper and bolt assembly from model 1. It costs 20-30 bucks more but you dont have to put it together. I did it that way. I bought a complete Stag arms lower for 199 and my Colt upper complete for 350 with shiping
Its a cheap Ruskie made scope I bought on closeout. Its a 6-24x adjustable. Im only using it for prarie dog killing at 400 yards. Normally I wouldnt go with lower end scopes but this one is actually pretty ok, A fullsize AR doesnt recoil much so I wasnt worried about it shaking the scope off target like some bigger bore guns do.
It actually balances just fine. The weight is well centered and doesnt make the gun front or rear heavy.