AR Build, Upper Reciever

My choice for upper receiver is the VLTOR MUR-1A. I chose this upper receiver for the following reasons:
1) The stock bushmaster upper has a built-hand-guard, which makes mounting optics darned near impossible.
2) I wanted an all mil-spec build both for toughness and parts compatibility.
3) The MUR-1 is machined from forged billet, and has extra material and bracing, making it arguably the strongest upper on the market.

I had to take the receiver to a gunsmith to swap the barrel over, so while I am waiting on my lower receiver parts, I went ahead and got that done. In the next post I will show you my choice of hand-guard and explain the logic behind my choice.