SIG SG 540

The SG 540 is a 5.56×45mm NATO assault rifle developed in the early 1970s by Schweizerische Industrie Gesellschaft (SIG, currently SAN Swiss Arms AG) of Neuhausen, Switzerland as a private venture primarily destined for export markets and as a potential replacement for the 7.5×55mm Swiss SG 510 automatic rifle known as the Stgw 57 in Swiss service.

SG 540
The SIG SG 540 with fixed stock
TypeAssault rifle (SG-540)
Carbine (SG-543)
Battle Rifle (SG-542)
Place of originSwitzerland
Service history
In service1977–present
Used bySee Users
WarsLebanese Civil War
The Troubles
Somali Civil War
Ivorian Civil Wars
Syrian Civil War
Militias-Comando Vermelho conflict
Production history
DesignerSchweizerische Industrie Gesellschaft (SIG)
Designed1970s
ManufacturerManurhin (France)
INDEP (Portugal)
FAMAE (Chile)
Produced1977–2002
VariantsSG 542, SG 543
Specifications
MassSG 540: 3.52 kg (7.76 lb) fixed stock
SG 542: 3.55 kg (7.8 lb)
SG 543: 3 kg (6.6 lb) folding stock
LengthSG 540: 950 mm (37.4 in) stock extended / 733 mm (28.9 in) stock folded
SG 542: 1,000 mm (39.4 in) stock extended / 754 mm (29.7 in) stock folded
SG 543: 805 mm (31.7 in) stock extended / 569 mm (22.4 in) stock folded
Barrel lengthSG 540: 460 mm (18.1 in)
SG 542: 465 mm (18.3 in)
SG 543: 300 mm (11.8 in)

CartridgeSG 540, SG 543: 5.56×45mm NATO
SG 542: 7.62×51mm NATO
ActionGas-operated, rotating bolt
Rate of fire650–800 rounds/min
Muzzle velocitySG 540: 980 m/s (3,215 ft/s)
SG 542: 820 m/s (2,690.3 ft/s)
SG 543: 875 m/s (2,870.7 ft/s)
Effective firing range100–500 m sight adjustments
Feed system20- or 30-round detachable box magazine
SightsRear: rotating diopter drum; front: hooded post
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