The U.S. Military has a new machine gun and a new rifle in a new caliber. SIG Sauer has confirmed the final delivery of the Next Generation Squad Weapons (NGSW) systems to the U.S. Army, consisting of new 6.8x51mm Hybrid ammunition, the NGSW-AR lightweight belt-fed machine gun, the SIG NGSW-R rifle, and SIG suppressors. Ron Cohen, SIG Sauer President/CEO stated that work with U.S. soldiers has “led to rapid advancements over the current weapons systems and resulted in our delivery of the most innovative Next Generation Squad Weapons system to the U.S. Army.”

The new systems will shoot 6.8×51 Hybrid ammunition — a lightweight cartridge designed to handle higher pressures resulting in increased velocity and terminal performance. In civilian form, SIG Sauer calls this cartridge the 277 SIG FURY. The 277 SIG Fury and the military 6.8x51mm cartridges feature a conventional brass upper case body with a steel alloy bottom, case-head section. The hybrid design allows the ammo to run at significantly higher pressures than conventional ammunition. SIG Sauer states that “despite its revolutionary design, [this] hybrid ammunition can be manufactured on a widespread basis immediately.”

The SIG Sauer 6.8mm hybrid ammunition is designed for increased penetration at greater distances. Cohen continued, “using patent-pending technology the SIG Sauer Ammunition Division has engineered a completely new cartridge resulting in a more compact round, with increased velocity and accuracy, while delivering a substantial reduction in the weight of the ammunition.”

This video shows gun features and includes firing sequences with thermal cameras (1:50 time).

The new 6.8x51mm Hybrid ammo gives the new guns significant advantages: “The SIG Sauer Lightweight Belt-Fed Machine Gun (NGSW-AR) doubles the effective range and is 40% lighter than the current M249 while maintaining the preferred belt-fed operation, with reduced felt recoil to increase accuracy. The SIG SAUER Rifle (NGSW-R) is built on the foundation of the battle tested MCX platform with the added firepower of the 6.8×51 round; both the NGSW-AR and NGSW-R feature familiar AR-style ambidextrous ergonomics designed for a seamless transition from the legacy weapons to the SIG NGSW system.”

SIG SAUER Lightweight Machine Gun (NGSW-AR)
The SIG Sauer NGSW-AR is a light-weight (under 15-lb.), medium-caliber machine gun chambered for 6.8x51mm Hybrid ammunition. SIG Sauer designed the NGSW-AR to be 40% lighter than current systems, and dramatically reduce felt recoil while maintaining traditional belt-fed operation to increase downrange capability. This 6.8mm machine gun features ambidextrous AR-style ergonomics, quick detach magazines, increased M1913 rail space for optics, folding buttstock, and quick-detach suppressor. SIG Sauer claim this NGSW-AR “vastly improves upon the operation and function of the legacy M249.”

SIG SAUER Rifle (NGSW-R):
The NGSW-R lightweight rifle (aka MCX-Spear) is derived from existing SIG military rifles with the added firepower of the 6.8mm round. Features include a fully collapsible and folding stock, rear and side charging handle, free-floating reinforced M-LOK™ handguard, fully ambidextrous controls, and quick-detach suppressor.

277 SIG FURY (6.8x51mm) from SIG Sauer
The 6.8x51mm cartridge will be offered by SIG Sauer in a civilian version called the 277 SIG FURY. This boasts a SAAMI maximum average pressure of 80,000 psi, driving a 135-grain bullet to 3,000+ fps. That 80K PSI pressure is WAY higher than almost all other cartridge types. To achieve these high pressures, the 277 FURY uses a hybrid case with a brass body and harder alloy metal case head. This design allows the cartridge to run very high pressures. Dan Horner of SIG Sauer told us: “When the handloaders get hold of this brass, it will be a game-changer for sure”. We envision this cartridge could be necked down to 6.5 mm and it would dramatically out-perform the 6.5 Creedmoor. And yes the official name of the cartridge is all caps “277 SIG FURY”.

The Sporting Arms and Ammunition Manufacturers’ Institute, Inc., (SAAMI), has announced the acceptance of three (3) new cartridges for SAAMI standardization: 1) 277 SIG FURY; 2) 6.5 Weatherby Rebated Precision Magnum (WBY RPM); 3) 6.8 Western. While the 277 SIG FURY was developed originally for the U.S. Military, it should serve well for hunters, as will the new 6.5 Weatherby RPM and 6.8 Western. SAAMI has standardized the dimensions, max pressures, and load specs for all these three new cartridges.

277 SIG FURY from SIG Sauer

Developed by SIG SAUER for the U.S. Military, the 277 SIG FURY boasts a SAAMI maximum average pressure of 80,000 psi, driving a 135-grain bullet to 3,000+ fps. That 80K PSI pressure is WAY higher than almost all other cartridge types. To achieve these high pressures, the 277 FURY uses a hybrid case with a brass body and harder alloy metal case head. This design allows the cartridge to run very high pressures. Dan Horner of SIG Sauer told us: “When the handloaders get hold of this brass, it will be a game-changer for sure”. We envision this cartridge could be necked down to 6.5 mm and it would dramatically out-perform the 6.5 Creedmoor. And yes the official name of the cartridge is all caps “277 SIG FURY”.

LINK: 277 SIG FURY official SAAMI Cartridge and Chamber Diagram (PDF)

6.5 Weatherby Rebated Precision Magnum

Developed by Weatherby, the 6.5 Weatherby Rebated Precision Magnum (WBY RPM) was introduced with a maximum average pressure of 65,000 psi, with a 140-grain bullet traveling at a velocity of 3,075 fps. The 6.5 WBY RPM offers signficantly higher velocities that most other 6.5mm cartridges, including the 6.5-284 and .265 Win Mag. SEE 6.5 Cartridge Comparison Table

LINK: 6.5 Weatherby RPM official SAAMI Cartridge and Chamber Diagram (PDF)

6.8 Western from Winchester

Developed by Olin Winchester, the 6.8 Western was introduced with a maximum average pressure of 65,000 psi, with a .277-caliber 175-grain bullet traveling at a velocity of 2,840 fps. A shorter variant of the Winchester Short Magnum (WSM) family, the new cartridge appears to be about .090″ shorter than the .270 WSM. It has the same 35-degree shoulder angle as the .270 WSM.

LINK: 6.8 Western official SAAMI Cartridge and Chamber Diagram (PDF)

For additional information on these new cartridge designs and other recently accepted cartridge and chamber designs, visit SAAMI.org.