For other variants, see 552 Commando and SIG SG 550
"Short range assault rifle, with low to medium stopping power depending on the caliber."
— In-game description

The 556xi is an assault rifle featured in Tom Clancy's Rainbow Six Siege. It is available for use by FBI SWAT Recruits and the Operator Thermite.

Situations and Terrorist Hunt

In the No Intel Situation, the Operator deployed is Thermite, who is equipped with a 556xi and an M45 MEUSOC as a sidearm.


The SIG SG 556 is a 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.[1]

In-game, the 556xi is suited for short-to-mid range engagements. While it's fire rate is nothing to shrug off at just below 700 RPM, it still leaves something to be desired in close range combat in comparison to faster firing weapons.

Weapon Attachments

Under Barrel


Patch Changes