Instead of building another AR-15, I was considering purchasing a Sig 556 rifle because off the price drop. I can get one for about $900.00 now (which is less than what I spent on my last AR build). Now, it's not all about the value that is selling me on this gun. The sig 556 seems like a pretty solid gun. I held one and it feels pretty good in my hands. I wanted some opinions about the Sig 556 from you guys before I go through with anything. Anyone fired one before?