Firearms / Assault rifles / SIG SG-540

SIG SG-540

General Facts

  • TYPE
    Assault rifle

  • ORIGIN
    Switzerland

  • NICKNAMES
    -

  • DESIGNED
    Mid 1970’s

  • DESIGNER
    SIG

  • PRODUCTION
    1977 - 2002

  • PRODUCERS
    Chile - FAMAE France - Manurhin Portugal - INDEP

  • QUANTITY
    Unknown

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Limited weight
    Cheap to produce
    Reliable
    Weak bipod

Introduction

The SG-540 is an assault rifle of Swiss origin. The design has many elements of the SG-530 prototype, which was not taken into production due to its costly roller locking mechanism. The SG-540 was developed as a much cheaper alternative. The later and higher quality SG-550 was based on the SG-540 design.

Design

The SG-540 has a conventional layout. To keep costs down it has a two piece stamped metal receiver and it uses a long stroke gas piston and rotating bolt. The forearm is made of plastic and a plastic fixed butt or folding metal butt is fitted. The three position gas piston allows use in harsh conditions and the firing of rifle grenades. A bipod that folds along the forearm is standard.

Firepower

The SG-540 fires the 5.56x45mm M193 round from 20 or 30 round magazines. It is a select fire weapon with single shot, burst fire and fully automatic capability. It has a cyclic rate of fire of 650 to 800 rounds per minute, varying due to fouling and gas regulator setting. The SG-542 variant fires the more powerful 7.62x51mm round from 20 round magazines. By closing the gas regulator rifle grenades can be fired.

Users

The SG-540 has been sold to many nations, but mostly in limited quantities. Most customers are African and South American nations. The majority of SG-540 were produced in France due to strict Swiss export regulations. It was never adopted by Swiss forces.

Variants

SG-543

The SG-543 is the carbine version of the SG-540. It has the same design as the SG-540, but features a shorter forearm and barrel. Unlike the full size SG-540 it is not available with a fixed stock, the side folding metal stock is standard. There is no bipod mounted under the forearm.

TypeAssault rifle
Caliber5.56x45mm M193
Magazine20, 30 rounds
OperationGas operated, long stroke gas piston, closed bolt
Fire selector0-1-3-F
Rate of fire650 - 800 rpm
Barrel length300 mm
Rifling6 grooves, 305 mm right hand twist
Muzzle velocity875 m/s
StockFoldable
Length805 mm / 569 mm
Width?
Height?
Weight3.0 kg
SightsIron sights, cylindrical post front, aperture rearsight, 100 to 500 m gradations, 425 mm
Remarks-

SG-540

The SG-540 is the standard full size assault rifle variant. It fires the 5.56x45mm M193 round from 20 or 30 round magazines. It is fitted with a fixed plastic stock or side folding metal stock. A bipod that folds along the forearm is standard.

TypeAssault rifle
Caliber5.56x45mm M193
Magazine20, 30 rounds
OperationGas operated, long stroke gas piston, closed bolt
Fire selector0-1-3-F
Rate of fire650 - 800 rpm
Barrel length460 mm
Rifling6 grooves, 305mm right hand twist
Muzzle velocity980 m/s
StockFixed
Length950 mm
Width?
Height?
Weight3.26 kg
SightsIron sights, cylindrical post front, aperture rearsight, 100 to 500 m gradations, 495 mm
RemarksFixed foldable bipod
TypeAssault rifle
Caliber5.56x45mm M193
Magazine20, 30 rounds
OperationGas operated, long stroke gas piston, closed bolt
Fire selector0-1-3-F
Rate of fire650 - 800 rpm
Barrel length460 mm
Rifling6 grooves, 305 mm right hand twist
Muzzle velocity980 m/s
StockFoldable
Length0.950 mm / 0.720 mm
Width?
Height?
Weight3.31 kg
SightsIron sights, cylindrical post front, aperture rearsight, 100 to 500 m gradations, 495 mm
RemarksFixed foldable bipod

SG-542

The SG-542 is the battle rifle variant of the SG-540. It is similar in most aspects, but fires the 7.62x51mm round from a 20 round magazine. Due to the heavier recoil the SG-542 is mostly fitted with the fixed plastic stock. A bipod that folds along the forearm is standard.

TypeBattle rifle
Caliber7.62x51mm NATO
Magazine20 round
OperationGas operated, long stroke gas piston, closed bolt
Fire selector0-1-3-F
Rate of fire650 - 800 rpm
Barrel length465 mm
Rifling4 grooves, 305 mm right hand twist
Muzzle velocity820 m/s
StockFixed
Length1.000 mm
Width?
Height?
Weight3.55 kg
SightsIron sights, cylindrical post front, aperture rearsight, 100 to 600 m gradations, 528 mm
RemarksFixed foldable bipod
TypeBattle rifle
Caliber7.62x51mm NATO
Magazine20 round
OperationGas operated, long stroke gas piston, closed bolt
Fire selector0-1-3-F
Rate of fire650 - 800 rpm
Barrel length465 mm
Rifling4 grooves, 305 mm right hand twist
Muzzle velocity820 m/s
StockFoldable
Length1.000 mm / 754 mm
Width?
Height?
Weight3.55 kg
SightsIron sights, cylindrical post front, aperture rearsight, 100 to 600 m gradations, 528 mm
RemarksFixed foldable bipod

Copyright © 2002 - 2014 Weaponsystems.net