10 Best Rifle Features of the Sig Sauer SIG556xi

Building on the strengths of the SIG550 series of Swiss military rifles, as well as those of the later SIG556 series here in the United States, the new SIG556xi from Sig Sauer takes the platform solidly into the 21st century.

The rifle is modular, mission-configurable and multi-caliber, making it ideally suited for a wide variety of missions.

Read on to find out about some of its top features.

Sig Sauer SIG556xi full — The Sig Sauer SIG556xi.

1. The heart of the SIG556xi is its proven gas piston operating system, featuring an adjustable regulator and extreme reliability as well as durability.

Sig Sauer SIG556xi trigger — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi two-stage trigger — The Sig Sauer SIG556xi.

2. The SIG556xi also features a crisp and highly shootable two-stage trigger, ideal for both military and LE applications.

Sig Sauer SIG556xi ambi controls — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi ambi — The Sig Sauer SIG556xi.

3. The SIG556xi’s ambidextrous controls allow for an officer to fire the carbine from either shoulder quickly and easily, allowing for greater tactical flexibility.

Sig Sauer SIG556xi grip — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi pistol grip — The Sig Sauer SIG556xi.

4. A highly ergonomic pistol grip is included with SIG556xi, offering enhanced control and handling characteristics for the carbine.

Sig Sauer SIG556xi muzzle feature — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi muzzle — The Sig Sauer SIG556xi.

5. The threaded muzzle of the SIG556xi can accept a wide range of accessories such as muzzle brakes, flash suppressors and silencers.

Sig Sauer SIG556xi stock open — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi stock cheek — The Sig Sauer SIG556xi.

6. The highly ergonomic stock of the SIG556xi features an adjustable cheek riser for employing red-dot sights or optics on the carbine.

Sig Sauer SIG556xi stock — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi collapsed stock — The Sig Sauer SIG556xi.

7. The stock of the carbine is also foldable for simplified storage as well as discreet portability. The SIG556xi can also accept a variety of different stock types, be they fixed, collapsible or folding, making the carbine highly adaptable.

Sig Sauer SIG556xi forend feature — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi forend — The Sig Sauer SIG556xi.

8. The SIG556xi also can accept a variety of forend systems, allowing officers to go from a smooth forend to a quad-rail without tools.

Sig Sauer SIG556xi upper — The Sig Sauer SIG556xi.

Sig Sauer SIG556xi mid — The Sig Sauer SIG556xi.

9. The upper (rather than the lower) receiver of the SIG556xi is serialized, meaning the lower receiver can be more easily and affordably swapped out. This allows officers to more easily facilitate moves between configurations for different missions.