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The SG 550 is an assault rifle manufactured by Swiss Arms AG (formerly Schweizerische Industrie Gesellschaft) of Neuhausen, Switzerland; (SG is an abbreviation for Sturmgewehr, or "assault rifle"). The rifle is based on the earlier 5.56 mm SG 540 and is also known as the Fass 90 (Fusil d'assault 90 / Fucile d'assalto 90) in French / Italian or Stgw 90 in German (Sturmgewehr 90).
- Type: Assault Rifle
- Caliber: 5.56x45mm NATO
- Weight: 7.1 lbs (3.2 kg)
- Length: 28.7 in (73 cm) (stock extended)
- Barrel length: 8.9 in (22.6 cm)
- Capacity: 5, 20, 30
- Fire Modes: Safe/Semi-Auto/Burst/Full-Auto
The SG 552 Commando carbine was introduced in 1998. It has a shorter 226 mm (8.9 in) barrel (with an open, 3-prong flash suppressor) and gas tube, ventilated handguards and a redesigned bolt carrier group that was integrated with the piston rod to form a single moving assembly. The return mechanism has been moved to the rear of the receiver housing and its recoil spring is guided in a way analogous to the AK-47, on a steel guide rod (later models feature a polymer guide rod) resting against the lower receiver's rear surface under tension of the compressed recoil spring. Like the SG 550/551, this model can accept rails and accessories enabling the use of optics. A long barrel version of the SG 552 known as the SG 552 LB incorporates a 346 mm (13.6 in) barrel designed to fire rifle grenades and mount a bayonet.
SG 551 Edit
The SG 551 carbine has a shorter 363 mm (14.3 in) barrel, gas tube and piston compared to the SG 550. The handguards were also changed and the bipod removed. The SG 551 cannot be used with a bayonet or to fire rifle grenades. The SG 551 comes in several specialized variants designed for use with security and special forces. Among those variants are: the SG 551-1P police carbine (designed to engage point targets out to 300 m, equipped with a Hensoldt 6x42 BL telescopic sight and detachable cheek riser), the SG 551 SWAT carbine (coated with a corrosion-resistant finish and equipped with an optical sight, for example Trijicon's ACOG 3.5x35; this variant can also accept mission-critical accessories such as a bipod, laser pointer or tactical light) and the SG 551 LB carbine with an extended barrel 454 mm (17.9 in) that enables the use of rifle grenades.
The SG-551 was used as an assault rifle by many of Bourne's enemies.Simon Ross at the Waterloo Station, this scene is the same from The Bourne Ultimatum.