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Semi-auto rifles

SIG Sauer SIG551-A1

SIG Sauer SIG551-A1 — documented specs: caliber 5.56x45 NATO, barrel length 254–406 mm (10–15.98 in), overall length 757–917 mm (29.8–36.1 in), weight 3.175–3.311 kg (7–7.3 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)
Depends on the configuration
Era
Present (from 1991)
Origin
United States
Calibers
5.56x45 NATO

A gun counts as a handgun (Kurzwaffe) if barrel and breech together measure no more than 30 cm or its shortest length in proper use is no more than 60 cm – barrel length and stock (fixed, folding or telescoping) of the individual configuration decide. German WaffG, Annex 1 Sec. 1 Subsec. 1 No. 2.5.

Also known as: SIG 551-A1 · SIG551 A1

Specifications

Action
Gas piston
Sights
Aperture sight
Barrel length
254–406 mm (10–15.98 in)Depending on variant · varies by model
Overall length
757–917 mm (29.8–36.1 in)Depending on variant · varies by model
Weight
3.175–3.311 kg (7–7.3 lb)Depending on variant · without magazine · varies by model
Capacity
20–30Depending on variant · magazine

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