My dad has finally decided to get into the AR thing and was asking for my thoughts on which AR to get. We went to our LGS and I tried walking him through some of the different options. In the end he like the Sig 516 and the Colt 6940. He liked that the Sig comes with a lifetime warranty. He also liked the battle sights it came with (yes, I know any set of battle sites can be swapped out). I personally am for the Colt, as its record is impeccable and the fact that it doesn't need a lifetime warranty...the thing is built to last (I think there is one though...can anyone confirm that for me?). The price difference is about $100 in favor of the Sig, but I don't think that is really something he is considering (the difference in price...not the price overall). So what do you guys/gals think? Why?