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A better comparison would be the SG556 to the 551 since that's the model it's based off.
"Due to import restrictions, the American civilian market required a partially American-made version. The SIG 556 is a commercial variant of the SG 551 designed to meet these requirements. The main difference is a new aluminum lower receiver that accepts M16 magazines and an M4 telescoping buttstock. The barrels twist rate is 177.8 mm (1:7 in). Picatinny rails are installed on the receiver and incorporated into the foregrip for optics and accessories. The diopter sights of the rest of the SG 550 family have been replaced with simpler front and rear flip-up sights. The SIG 556 lacks full-auto capability and the overall length is 940 mm (37.0 in). Most other parts are interchangeable with the SG 550 series.[6]"
one more reason wikipedia shouldn't be used as a reference
"the ### is the same as the yyy except for this and that and this other thing and oh yeah there is this slight difference here and there but except for that the two items are the same...."
i like armedaltas answer....it is the closest to the truth...
one more reason wikipedia shouldn't be used as a reference
"the ### is the same as the yyy except for this and that and this other thing and oh yeah there is this slight difference here and there but except for that the two items are the same...."