I'm a brand new owner of a SIG556 DMR, and I found this forum researching it after the purchase. So I come into this technical forum to find problem after problem with the 556.
Did I buy a piece of crap?
I'm in the same boat as you, friend. I found this site after buying my 556 SCM, and was taken by surprise at the plethora of negative posts concerning this rifle. I have two of the negatives outright: Rifle was produced in the allegedly 'cursed' 2009 period, and she's ripe for the bolt carrier wear/ trunnion 'hump' affliction. As Zeus indicated, research is a buyer's best friend. I will admit that I did not research the rifle as thoroughly as I should have. I bought it because of SIG's reputation based on my P226 ownership (Best handgun I own!). I will also admit that I would not
have bought the 556 if I had found this site first. So, after everything is said and done (and $1700.00 worth of rifle and accessories later), my dilemma now, if you will, is to either dump her while she's still unfired (by me anyway), or use her and come what may. Good luck with yours and safe shooting! Best!