What is sig556?

The SIG556 is a semi-automatic rifle manufactured by SIG Sauer. It uses a gas piston operating system and is chambered for the 5.56x45mm NATO cartridge. The rifle features a 16-inch barrel and has a weight of 7.5 pounds. It has a Picatinny rail on the top of the receiver for mounting optics or other accessories and comes with flip-up iron sights. The SIG556 also has a collapsible stock for ease of transportation and storage. The rifle is popular with law enforcement and military personnel as well as civilian shooters who enjoy the rifle's reliability, accuracy, and versatility.