The SIG SG 556 is a civilian derivative of the SIG SG 550 assault rifle and is the latest generation of the rifle series. The SIG SG 556 is a semi-automatic rifle manufactured by Swiss Arms AG that chambers the 5.56x45mm NATO round. Unlike the 550, the 556 lacks full-auto capability and the overall length is 940 mm (37.0 in). One difference is a new aluminum lower receiver that accepts M16 STANAG magazines and an M4 telescoping buttstock.
The weapon is featured in several installments of the Tom Clancy's Rainbow Six Franchise and is designated the 556xi.
The original article was at SIG SG 550. The list of authors can be seen in the page history.
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