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Sig Sauer 556xi Standard, 5.56mm

Sig's 556xi ships with a Swiss-style folding stock, raised cheek piece, ambidextrous charging handle, and a 30rd magazine.

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The evolution of the SIG556® platform, the new SIG556xi gives you unparalleled modularity in barrel length, caliber, magazine type, and stock configuration. A folding stock combined with ambidextrous magazine release, bolt release, safety selector and charging handle. Accepts any MIL-SPEC AR-15/M4/M16 or AK-style magazines depending upon lower.


- 3-position adjustable gas piston operating system with rotating bolt
- Swiss-style folding stock with removable cheek riser
- Ambidextrous controls
- Locking flip-up front and rear sights
- Polymer handguard (compatible with Magpul® MOE® accessories)

Specs - More Info
Additional Info
SKU R556XI-16B-C
UPC Code 798681468461
Caliber .223 / 5.56
Manufacturer Sig Sauer
Overall Length 35.8 in
Sights (detailed) Flip up sights
Weight Empty 7.1 lb
Stock Material Polymer
Barrel Length (in) 16 in
Rifling 1 in 7 in
Number of Grooves 6
Mag Capacity / Rounds 30rd
Number of Mags 1
Accessory Rail Not Applicable
Safety (detailed) Ambidextrous safety
FFL Requirements Must be shipped to FFL dealer for transfer.
Warranty Warranty provided by Sig Sauer. Warranty information is available for Sig Sauer products at
Customer Reviews (1)
VG rifle with proper options
I have had my SIG 556 xi for two years and feel it was a great fore runner for the MCX and MPX. Now if I could find an aluminum forearm for IT! Review by Leatherneck 257 (Posted on 9/12/2017)
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