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Semi-auto rifles

SIG Sauer SIG556

SIG Sauer SIG556 — documented specs: caliber 5.56x45 NATO, barrel length 406–457 mm (15.98–17.99 in), overall length 911–996 mm (35.87–39.21 in), weight 3.538–4.309 kg (7.8–9.5 lb), capacity 20–30. 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

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 556 · SIG556 Classic

Specifications

Action
Gas piston
Barrel length
406–457 mm (15.98–17.99 in)Depending on variant · varies by model
Overall length
911–996 mm (35.87–39.21 in)Depending on variant · varies by model
Weight
3.538–4.309 kg (7.8–9.5 lb)Depending on variant · without magazine · varies by model
Capacity
20–30Depending on variant · varies by model

Sources

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.

Related

Catalog as of