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RIP, M4 Carbine: How Sig Sauer Won the Big NGSW Gun Contract

Sig Sauer photo of XM5 and XM250 rifles
Sig Sauer photo of XM5 and XM250 rifles.

United States Army Awards NGSW Contract to Sig Sauer – Earlier this week, the United States Army announced that it had selected Sig Sauer to produce the Next Generation Squad Weapons (NGSW), which will eventually replace the legacy M4 carbine and M249 light machine gun. Following a rigorous 27-month prototyping and evaluation period, the Army awarded Sig Sauer, Inc. a 10-year firm-fixed-price follow-on production contract to manufacture and deliver two NGSW variants.

The U.S. Army had sought to replace the legacy small arms with a new weapon that could serve as both the main battle rifle and squad automatic weapon – both chambered in the newly developed 6.8x43mm Remington Special Purpose Cartridge (6.8 SPC).

The new ammunition, which was developed by Remington Arms in collaboration with members of the United States Army Marksman Unit and the United States Special Operations Command, will serve as a replacement to the 5.56 NATO cartridge. The 6.9 SPC is based on the .30 Remington cartridge and is essentially “midway” between the 5.56x45mm NATO and the 7.62x51mm NATO in bore diameter. However, it still uses the same diameter bullet as the .270 Winchester hunting cartridge.

In January, the Army awarded Winchester, the largest manufacturer of small-caliber ammunition for the U.S. military, a $20 million in cost-plus and firm-fixed-price contract to produce the 6.8mm ammunition for the NGSW.

Multiple Choices

The Army had been conducting tests of the three previously selected weapons from General Dynamics Ordnance, Sig Sauer, and Textron Systems. Each of the prototypes differed in design, yet all three were chambered for the aforementioned 6.8mm round. The goal of the NGSW was to find a single weapon that could replace the two legacy platforms with an adaptable, modular firearm.

The Sig Sauer design was based on its MCX firearms line. The rifle version has a 13-inch barrel and thus is as compact as the M4 Carbine it will replace, while the machine gun version is equipped with a 16-inch heavy barrel and can also be belt-fed to provide suppressing fire. Both feature folding stock capability to allow for easier storage and transport. The Sig Sauer’s platform is also similar enough to the legacy systems that soldiers wouldn’t need additional training.

“The U.S. Army is taking a bold step toward command of the 21st century battlefield and SIG SAUER is immensely proud to be the selected provider for this historic revolution in infantry weapons,” said Ron Cohen, president and CEO of Sig Sauer, Inc.

“The fielding of the Sig Sauer Next Generation Squad Weapons System will forever change the dynamic of military engagement for Americas warfighters with American innovation and manufacturing,” Cohen continued. “We commend U.S. Army leadership for having the vision to undertake this historic procurement process to deliver a transformational weapon system to our warfighters. This award is the culmination of a successful collaboration between Sig Sauer and the U.S. Army, and we look forward to the continuing partnership.”

End of the Line for the M16 Series

The XM5 rifle will serve as a replacement to the M4, which was introduced in 1994 and is essentially a shorter and lighter variant of the M16A2 assault rifle. The United States Air Force had first adopted the AR-15, later designated the M16, in 1963. The United States Army and United States Marine Corps began to issue the M16 in 1966 to units heading to Vietnam, where it had a rocky start.

However, in 1969, the improved M16A1 replaced the M14 to become the U.S. military’s standard service rifle. It went on to become the longest continuously serving rifle in U.S. military history.

The Army will also “cut out” the SAW – as the XM250 automatic replacement will take on the role that has been served since 1984 by the M249 light machine gun, formerly designated as the M249 Squad Automatic Weapon (SAW)

The value of the initial delivery order for the contract is $20.4 million for weapons and ammunition that will undergo testing, the Army also announced. The contract also covers accessories, spare parts, and contractor support. It will also provide other Department of Defense (DoD) services, and potentially, Foreign Military Sales (FMS) countries the opportunity to purchase the newly selected NGSW weapons.

Now a Senior Editor for 1945, Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers and websites. He regularly writes about military hardware, and is the author of several books on military headgear including A Gallery of Military Headdress, which is available on Peter is also a Contributing Writer for Forbes.

Written By

Expert Biography: A Senior Editor for 1945, Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers, and websites with over 3,000 published pieces over a twenty-year career in journalism. He regularly writes about military hardware, firearms history, cybersecurity, and international affairs. Peter is also a Contributing Writer for Forbes. You can follow him on Twitter: @PeterSuciu.



  1. Greg Ewing

    April 24, 2022 at 9:54 am

    You might want to check your facts. The new rifle does not have anything to do with the 6.8 SPC cartridge. It’s a completely new cartridges.

    • Joshua

      April 25, 2022 at 8:21 am

      Yup…at one point it becomes the 6.9 SPC. A little attention to detail.

      • John Levanger

        April 25, 2022 at 3:02 pm

        .277 SIG Fury is the new cartridge. Clean sheet design loosely based off of the legacy 7.62×51 designed with a bi metal case (brass/SS) shooting a 135 gr bullet at 3000 fps. It’s unique feature is an 80k psi chamber pressure

  2. Bruce A Hill

    April 24, 2022 at 12:31 pm

    It’s 6.8X51mm. Or 277 Fury

    • Drew Shifley

      April 25, 2022 at 11:10 am

      I can see the new 6.8×51mm replacing the 7.62×51 but I cannot see the 6.8×51mm replacing the 5.56 for the support troops. I served in the Army Reserves in a support unit and I don’t think we need a powerful round like this.

      • Used up Taxpayer

        April 26, 2022 at 12:22 am

        Predicted : the Army lives really sound of the Sig Sauer name and I’m sure they “lobbied” hard to ensure the worst, most conventional rifle woul “win.” POS

        • Rick Randall

          April 26, 2022 at 10:10 am

          Of course, the fact that Sig was the ONLY company in the end to produce a rifle, LMG, and ammunition combination that actually met the Army’s minimum requirements cannot be overlooked.

          Multiple companies submitted options. Only three companies survived the first cut by showing they had a credible potential to be better. One of those (interestingly enough, the Army favorite, Textron – the NGSW RFP was literally written around what AAI – later Textron – was telling the Army they could deliver after 13 years of development that the Army had already funded) flopped in final testing phase and was withdrawn.

          That left two choices – the GD/Beretta/True Velocity/Lone Star (replacing GD, once GD realized they were going to lose) and Sig.

          The GD/Beretta team didn’t even bother submitting a real LMG. They offered a heavy barrel version of their rifle, with a bipod. A 20 round heavy varreleled rifle. For a program whose core (and original goal) was all about selecting a squad light machinegun. Plus, being bullpups, the RM277 variants brought ALL the typical and inherent downsides of bullpups to the table. But, GD (who made the initial basic design choices before they even looked for partners to do the detailed work or develop the ammo) chose a bullpup layout as the only way they could see to get the necessary performance the Army specified, using what was pretty conventonal ammo.

          Sig, OTOH, adapted an existing GPMG design (that had proven itself very useful and desirable to SOCOM already) into a slightly smaller LMG (thus having an actual LMG to offer), and adapted an existing and in production rifle platform. So they knew they already had most of the bugs worked out at the beginning.

          Now they just had to.figure out how to hit the performance requirements without being too long (as a 20″ barrel like the GD plan would have been) in these conventional layouts. So they developed a new cartridge case design that is actually more.innovative than the True Velocity case (overall) that allowed them to hit the required velocities in a 1e” barrel with minor tweaks to some internal components. Cutting edge barrel.manufacturing also allowed them to achieve DOUBLE the Army required barrel life, even with the ridiculously high chamber pressures required.

          So, as of October/November 2021, the Army was faced with the choice of:

          1. A bunch of guns that had failed out of testing a few years earlier. (FN, Desert Tech, etc.)

          2. A highly ambitious program (AAI/Textron, with their innovating CT cased ammo from the LSAT program) that the Army had already dumped tens of millions of dollars of R&D into… that absolutely failed to deliver when crunch time arrived.

          3. An offering that really only promised lighter cartridges, but otherwise was lacking in real.innovation, had ergonomic and operation problems inherent to the basic layout, and the second biggest part of the program goals effectively ignored.

          4. Sig, who offered ammunition that delivered on requirements (albeit not as lightweight per round than the other companies, still lighter than equivalent traditinal brass cases would have), and two weapons platforms that both met (and in most regards, exceeded) the program requirements, and both of which were based closely on proven systems in actual production and use.

          I called this result back in 2019. If the Textron program didn’t deliver a credible performance at an acceptable price (yes, it would have been higher because of the unique nature of ammo and weapons, but as long as it didn’t head into “completely unaffordable” the price would be OK), then Sig was going to win. The LSAT derived Textron offering was the best option, *provided* it worked… but it was a hugh risk option *because* every piece of it was groundbreaking. All they had to do to.
          win was *work* and not break the bank.

          Sig was offering the Army what they actually asked for, at a very low risk, with readily estimated actual costs that we could reliably presume would be reasonable. So they were the clear “safe bet” overall and “Plan B” if Textron failed (as they did).

  3. Bart

    April 24, 2022 at 5:29 pm

    So we are changing to a bigger heavier cartridge, like a 7.62 case with a 6.8 diameter bullet. Was this not a factor to go with the 5.56 round back in the 60s. This will take up more space for Ammo and more weight for soldiers to carry same amount of ammo. This platform is still based on m16 design now just heavier. 5.56 round has killed a lot of enemy soldiers, what matters is where the round hits. All this has done is make some people rich and favors or kickbacks owed.

  4. Col (Ret) Dean F ONEIL

    April 24, 2022 at 9:14 pm

    Once again the Army has its head up its butt. New cartridge, new barrel, new gun. .308 cartridge is readily available-been around for years,but no the Army has to spend billions to reinvent the wheel.The communist bloc still uses the 7.62×39.

    • Adam

      April 25, 2022 at 7:51 pm

      Wow this article was written by a complete idiot. Do 5 minutes of research before you make an idiot of yourself.

    • Rick Randall

      April 26, 2022 at 9:43 am

      7.62x51mm NATO (even with inprovements) is not capable of meeting the performance requirements the Army sees as important moving forward (defeating the types of body armor we are seeing likely near peer adversaries start to field).

      The 6.8x51mm round was designed for different reasons than the 7.62x51mm (which inherited the performance requirements of .30-06, which had as an original basic requirement the ability to kill or disable horses at 1000 yards, like every other kate 19th Century cartridge- and yes, despite being adopted in 1906, based off a 1903 variant, the .30-06 is a *19th* Century design at heart).

      If 5.56x45mm could do the job the Army sees the standard rifle squad facing over the next 10-20 years and beyond, the Army would have stayed with it.

  5. JT Hjelle

    April 25, 2022 at 11:45 am

    You failed to answer the question posed: WHY did the army pick the Sig over the other rifles?

  6. Jacksonian Libertarian

    April 25, 2022 at 6:50 pm

    The failure to go to the faster in CQB, more carry friendly, bullpup design is a mistake. The fact is the M-4 was adopted because combat has become vehicle centric, and battle is now with smart missiles and drones, with rifles taking the place of emergency sidearms.

    A kinetic fight with the enemy is a strategic FAIL, as you should have identified and killed the enemy from kilometers away with a drone/missile. As the war in Ukraine has shown, Missilemen have replaced Riflemen on the battlefield.

  7. ebd10

    April 25, 2022 at 9:50 pm

    A heavy, bulky, and unwieldy rifle to replace a platform that has served successfully, in one form or another, for 60 years, combined with ruinously expensive to manufacture experimental ammo, indicates that the name of this system should be ‘The Kickback’

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