I have done quite a few searches on this forum for info / opinions of the Sig 556. The only good thread I found was about 2 1/2 years old. So, I am looking for more recent info / opinions. Price seems to be a non issue at this point, since the Sig 556 can be obtained for about the same price as an off the shelf AR.
I've got the 556 sig pistol and it makes a good noise but you can hit anything with it. I wish I had bought the rifle instead. One good thing is, I bumpfired it with a rubberband about 90 times and it never jammed and dumped 30 rounds in 3 seconds. That was a couple of years ago and I haven't fired it since. Sig makes good guns.