SIG 540

Army and Weapons | SIG 540 | SIG 540 is an assault rifle of the Swiss lines. Used by many soldiers, it is a symbol SIG Sauer, a company from Switzerland. French FAMAS use until replaced by troops Chile, Portugal, and Brazil are also users SIG 540. Many troops in Africa are still using this weapon. The SG540 is chambered for the 5.56x45 NATO round, which was held in a 30-round magazine. It has a high reliability and accuracy. SG 540 is air-cooled, gas-operated, selective fire assault rifle that fires from a closed bolt position. SIG designers used long-stroke piston-driven action (with the recoil spring wrapped around the piston rod itself) and adjustable gas regulator with three settings: "0"-which is used to launch rifle grenades, "1"-which is used in normal operation conditions and "2" are used in extreme environmental conditions or in the presence of heavy fouling. Firearms locked into battery by rotating bolt with two locking lugs heavy steel. Bolt head turned by the control cam picks up the helical slot machines to the bolt carrier.

When the shot was fired, propellant gases from the barrel inserted into the gas tube located above the barrel and put pressure back on the piston rod, which pushed back the bolt carrier. After a number of free travel built into the system to allow the projectile to go, the pressure drop in the residual gas barrels birth to a safe level, which allows the breech to be opened. Cam slot in the bolt carrier to actuate results Camming at stud bolts, rotate the bolt head out of engagement with the locking abutments in the receiver. Extracted the spent cartridge casing extractor claw contained within the bolt assembly while a bulge in one of the internal rail operator manual bolt at the top of the receiver acts as a fixed ejector, remove the casing through the port on the right side of the receiver housing.

The difference between the SG 542 and SG 540 was primarily the result of adopting, more powerful full-size rifle cartridge. SG 542 also uses a box magazine usually 20/30-round (5 and 10 magazines were also produced), but the view is modified by setting m 600 m next to the viewing position Drum 100, 300 and 500.

SG 543 carbine is a short variant of the SG 540 which has been modified with a shorter 300 mm (11.8 in) barrel, a shorter gas tube and piston rods and different handguard and sights with 100, 200, 300 and 400 m positions firing range. SG 543 has no integral bipod of the SG 540/542 and reduced the barrel can not be used to fire rifle grenades. SG 540 served as the basis for SG 541 prototype, which will be 550 SG which entered service with the Swiss Army as Stgw 90 (Sturmgewehr 90).

In addition, two semi-automatic variants produced by Manurhin between the 1970s and the early 1980s specifically for the European civilian market: FSA Manurhin called SIG and SIG Manurhin CSA This rifle chambered in .222 Remington and .243 Winchester respectively. Both are available with either a 5-round or 30-round magazine is reduced, and the choice of folding or fixed stock. The chambering is unusual for this type of military-style rifle was an attempt to comply with regulations in certain European countries imposed restrictions on civilian ownership of "military" cartridges such as the 5.56x45mm or 7.62x51mm NATO/.308 NATO/.223 Remington Winchester

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