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Semi-auto rifles

SIG Sauer SIGM400

SIG Sauer SIGM400 — documented specs: caliber 5.56x45 NATO, barrel length 406–559 mm (15.98–22.01 in), overall length 921–1,022 mm (36.26–40.24 in), weight 2.75–3.657 kg (6.06–8.06 lb), capacity 5–30. 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 M400 · SIG Sauer M400

Specifications

Action
Direct impingement
Barrel length
406–559 mm (15.98–22.01 in)Depending on variant · varies by model
Overall length
921–1,022 mm (36.26–40.24 in)Depending on variant · varies by model
Weight
2.75–3.657 kg (6.06–8.06 lb)Depending on variant · without magazine · varies by model
Capacity
5–30Depending 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