SIG Sauer SIG556xi

SIG Sauer SIG556xi — documented specs: caliber 5.56x45 NATO · 7.62x39 · .300 AAC Blackout, barrel length 406 mm (15.98 in), overall length 909 mm (35.79 in), weight 3.203–3.221 kg (7.06–7.1 lb), capacity 30. The source for each figure is listed below the specs (catalog as of 10/16/2026).

Category: Semi-auto rifles
Classification (DE): Long firearm
Era: Present (from 1991)
Origin: United States
Calibers: 5.56x45 NATO · 7.62x39 · .300 AAC Blackout

Derived from design and catalog dimensions under the German WaffG, Annex 1 Sec. 1 Subsec. 1 No. 2.5; the individual gun is what counts.

Also known as: SIG 556xi · SIG556 xi

Specifications

Action: Gas piston
Sights: Open sights
Barrel length: 406 mm (15.98 in)
Overall length: 909 mm (35.79 in)
Weight: 3.203–3.221 kg (7.06–7.1 lb)Depending on variant · without magazine · varies by caliber
Capacity: 30magazine

web.archive.org — product page sigarms.com/CatalogProductDetails/sig556xi-standard.aspx (version of 11/30/2014)
web.archive.org — product page sigarms.com/CatalogProductDetails/sig556xi-russian.aspx (version of 11/30/2014)

Sources

web.archive.org — product page sigarms.com/CatalogProductDetails/sig556xi-standard.aspx (version of 11/30/2014)
web.archive.org — product page sigarms.com/CatalogProductDetails/sig556xi-russian.aspx (version of 11/30/2014)

Specifications come from the source cited alongside them; counts are based on our catalog as of the date stated. Not legal advice: what follows from these figures in a given country is decided by that country’s law. Waffenschrank is not affiliated with the manufacturers named.

Other models in 5.56x45 NATO

Models from other manufacturers in the same caliber, drawn from the catalog in no particular order — not a recommendation and not a comparison of specs.

Catalog as of 10/16/2026

SIG Sauer SIG556xi

Specifications

Sources

Other models in 5.56x45 NATO

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