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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 the barrel to power the weapon's moving parts.
The 5.56×45mm NATO standard SS109/M855 cartridge was designed for maximum performance when fired from a 508 mm (20.0 in) long barrel, as was the original 5.56 mm M193 cartridge. Experiments with longer length barrels up to 610 mm (24.0 in) resulted in no improvement or a decrease in muzzle velocities for the SS109/M855 cartridge.
The SIG516 is a multi-caliber assault rifle, capable of selective fire. It fires from a closed bolt, and has a short-stroke push rod piston system. The gas piston pushes the bolt carrier rearward, where it is returned to the forward and locked position by a spring. This process loads the next cartridge.
STANAG magazines. The SIGM400 is a family of firearms manufactured by SIG Sauer. [1] The M400 is an air-cooled, direct impingement gas-operated, magazine-fed carbine that is based on the earlier AR-15 rifle. [2] Depending on the variant, it can be chambered for 5.56×45mm NATO or .300 AAC Blackout cartridges, and may have a fixed or telescoping ...
The .277 Fury or 6.8×51mm Common Cartridge, [4][5] (designated as the .277 SIG Fury by SAAMI [1]) is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
XM7 rifle. The XM7, previously known as the XM5, is the U.S. Army variant of the SIG MCX Spear, a 6.8×51mm (.277 in), gas-operated, magazine -fed assault rifle [1] designed by SIG Sauer for the Next Generation Squad Weapon Program in 2022 to replace the M4 carbine. The XM7 features a free-floating reinforced M-LOK handguard for direct ...
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 [4] 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.
SIG MCX. The SIG MCX is a family of firearms designed and manufactured by SIG Sauer, produced in both selective fire and semi-automatic only models, and features a short-stroke gas piston system, which is inherited from the earlier SIG MPX submachine gun. The MCX is available in rifle, carbine, short-barreled rifle, and pistol configurations ...