I believe the SIG will be the more durable action, however. I've read that the original configuration of the 556 will be offered next year. Essentially, it will be a 550 with a foldable, non-collapseable stock. Hopefully they will be smart enough to make the length of pull short enough or offer two or three buttstocks. Supposedly, it will have better front sights - like the original - and diopter rear sights. You could pound an AR-15 FLAT with the Sig.
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"Necessity is the plea of every infringement of human freedom. It is the argument of tyrants, it is the creed of slaves." ~ William Pitt, 1783
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