[Big Bore Lover]

Skillett,
The 556 I have is quite reliable and pretty accurate. Not quite as accurate as my RR mid length but it will work in a pinch. It is cleaner to operate not being a "gas impingment" system. The concrete commando stock is a joke and just had to go but other than that it has its place. Just so you know and pass it on to your friend, the 556 does a job on the finish of the upper receiver at the rear of the ejection port. Bounces brass off the receiver and, on mine at least removed the finish completely (down to bare metal). So far Sig has told me an "upper management decision" has been it is not an issue they will address. I know other owners that have had their uppers repaired/replaced by Sig. Maybe they just didn't like where I live or something. Other than that, the rifle is a plus. I won't say its the best the worlds ever seen but it is good. Tell your friend to shop it around as better prices can be had if the buyer does some looking. I say that as too damn many dealers think since it says Sig they can sell them at full mark up. NOT.