SG-550 is the official assault rifle of the Swiss Army (Fusil d’Assaut; F ass 90) manufactured by Swiss Arms (formerly SIG Arms AG). Designed in the 1980s , it was gradually introduced in 1988 in the Swiss army, thus replacing the Stgw 57/Fass 57 (also built by SIG). After twenty years of active service, the SIG 550 has been declined in different versions and sold to several intervention groups. SG 550 continues to offer it for export and it is its flagship product in the field of long guns

Technical

The regulatory SIG 550 in Switzerland uses the Swiss 5.6 mm ammunition designed for a normal range of 300 meters. Export versions chamber the 5.56mm NATO . An interesting feature of the SIG 550/551/552 are their translucent plastic magazines (20 and 30 rounds) which can be nested to facilitate rapid reloading. The SIG 550 is effective up to 400 meters with the use of the drum sight and the front sight, 600  m with a telescope.

Its main qualities are easy maintenance and precision, obtained at the expense of lightness and maneuverability, essential in urban combat. It is a weapon designed for “guerrilla” type combat with snipers, mobile, akin to snipers (snipers). It is also possible to mount a telescope on the SIG-550. All have a fire selector to choose the desired firing mode: semi-automatic, burst of three shots, automatic or safety. They can also accommodate various aiming aids instead of their standard firing devices. They are however equipped with a safety preventing the civilian shooter from using the weapon in 3-shot burst or automatic. The purchase of a weapon that can fire in bursts is subject to a permit (prohibited in Switzerland except with a special permit).

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