The SG 550 is a selective-fire 5.56×45mm NATO assault rifle firing from a closed bolt. It has a gas-actuated piston-driven long-stroke operating system derived from the SIG SG 540 series of rifles, which uses burnt powder gases vented through a port in …

在1970年代后期，瑞士军队打算研制一种新的小口径步枪，以取代 原来装备的S tgw57 （SG510）自动步枪。 初步试验是在5.6×48伊格尔口径（Eiger）和6.5×48 GP80两种弹药之间进行选择，原型枪则分别是SIG公司基于SG540的基础上改进的SG541，和国营伯尔尼兵工厂的 SGC42。 但最后，瑞士军队选择了在北约5.56×45mm口径的GP90弹，并选中了SIG的方案，但要求对SG541作进一步的改进。 在1983年，瑞士军队正式采用SG541的改进型，并定型为90式 …

Extensive selection of customizable SIG SAUER rifles & pistol configurations for precision hunting, defense, competitive shooting and tactical maneuverability.

The SIG Sauer SG 550 is the first in a series of gas operated rifles based on an AKM style action. This rifle uses a long-stroke gas piston and 2-lug rotating bolt and is built with a 20.8 inch barrel topped with a hooded front sight and a range-adjustable diopter sight at the rear.

the SiG 500 series of assault rifle comprises the older SG540 series and the visually similar, although more recent, SG550 series. Most models feature green-grey polymer furniture (hand guards, pistol grips, and stocks), which helps to distinguish them from rifles with a similar overall layout, such as the fN fAl.

The SIG SG 540 dispensed with the complex roller lock action, and instead used the simpler, yet robust rotating bolt action made famous by the AK series of rifles. However, the gas system was improved by adding an adjustable gas regulator.

The SG 550 (Assault Rifle 90), PE 90, is a light- weight assault rifle and used by the Swiss Army.

By understanding the dan-gers inherent in the use of any firearm, and by taking the precautions de-scribed herein, you can enjoy complete safety in the use of your Rifle. Failure to heed any of these warnings may re-sult in serious injury to you or others, as well as severe damage to the fire-arm or other property.

1999年5月5日 · SIG has again designed a gas-operated weapon with a piston acting on the bolt carrier, which locks and unlocks a rotating bolt with two front lugs. That apart, the SG550 is much less complex than the Stgw57, made up of only 174 …

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