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標題: 【異形的軍火庫】「步槍系列15」瑞士SIG SG-550槍系 [列印本頁]

作者: 異形 時間: 07-1-4 18:29
標題: 【異形的軍火庫】「步槍系列15」瑞士SIG SG-550槍系

[td]SIG 550 / Stgw.90 [td]SIG 551 [td]SIG 552

Caliber [td]5.56x45mm (.223 Rem) [td]5.56x45mm (.223 Rem) [td]5.56x45mm (.223 Rem)

Length (stock open / folded) [td]998 / 772 mm [td]833 / 607 mm [td]730 / 504 mm

Barrel length [td]528 mm [td]363 mm [td]226 mm

Weight empty [td]4.05 kg w/o magazine [td]3.3 kg w/o magazine [td]ca. 3.0 kg w/o magazine

Magazine capacity [td]20 or 30 rounds [td]20 or 30 rounds [td]20 or 30 rounds

Rate of fire [td]700 rounds/min [td]700 rounds/min [td]780 rounds/min

[size=+1]

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The SIG SG.550 assault rifle had been developed by Swiss company SIG as a competitor for Swiss Army assault rifle contest in 1979 - 1980. SIG 550 had been derived from previous model SIG 540 and SIG 541, and was adopted as a Stgw.90 assault rifle in 1983, but due to financial reasons production began only in 1986. Currently, the Stgw.90 is a standard Swiss service rifle and also offered for export. "Carbine" version and subcompact assault rifle versions available in the form of SIG-551 and SIG-552 "Commando", respectively.

Basically, the SIG-550 is a somewhat lightened and refined SIG-540/541 rifle. SIG-550 featured AK-47 style action, gas operated, with gas piston attached to the bolt carrier, and with rotating bolt with two massive lugs. The recoil spring is located around the gas piston rod, above the barrel, and the bolt carrier attached to the gas piston rod by the mean of removable charging handle. The gas port has gas regulator with two different open and one closed position (latter for firing rifle grenades). The receiver is made from stamped steel and has two major parts, upper and lower, which are connected by pushpins. The barrel is screwed into the upper receiver. The trigger unit has a safety/fire selector switch on the left side of the receiver, with 3 settings: safe, semi-auto, full-auto. If desired, additional module could be installed in the trigger mechanism to allow 3-rounds burst mode. Rear sights are drum-type (like those found on Heckler-Koch rifles). SIG-550 has muzzle compensator/flash hider of NATO-standard diameter, so it is possible to launch rifle grenades from the muzzle. The SIG-550 has integral folding bipods under the handguard, and issued with side-folding, skeletonized polymer buttstock. Every rifle of SIG-550 family can be fitted with proprietary, quick detachable scope mount. Swiss Stgw.90 are often seen with 4X fixed power scope, export versions can be equipped with commercial telescope sights, ACOG or "red dot" sights, depending on customer preferences. SIG-550 also can be fitted with bayonet.

The carbine version of the SIG-550 is called SG-551 and has shorter barrel. SIG-551 can't fire rifle grenades. Even more compact rifle, SIG-552, is similar to SIG-551 except that it has shorter handguard and barrel. Version of the 551, called SIG 551 SWAT, is intended for law enforcement and is equipped with acessory rails on the forearm and comes with Trijicon ACOG optical sight and cheekpad on the buttstock.

The SG-552 "Commando" is a very compact assault rifle of the same class as russian AKS-74U or German HK53 and G36C. Due to the short barrel and resulting short gas piston rod, the main spring in SG-552 was relocated to the receiver, behind the bolt carrier group, so the bolt carrier of the SG-552 is not 100% similar to the bolt carriers of the SG-550 and 551.

All SIG-550/551/552 rifles are equipped with semi-translucent plastic magazines that can be clamped toghether for faster reloading.

Civilian verions of the SIG-550 and 551 are known as "Stgw.90 PE" in Switzerland or 500-SP and 551-SP when sold for export.

SIG 551 - shortened version of the 550

SIG 550 / Stgw.90 field stripped, with acessories

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