|.223 Remington / 5.56x45|
|Weight Unloaded||9.5 oz|
|Country of Manufacture||United States|
Due to import restrictions, the American civilian market required a partially American-made version assembled by SIG SAUER, Inc. (not to be confused with the Swiss-German entity) in Exeter, New Hampshire. The SIG556 is a commercial variant of the SG 551 designed to meet these requirements.
The DMR variant features an extended barrel without the flash hider, and the barrel has a 1 in 8" twist rate.