How the Military Buys Its Guns: Procurement, Contracts & Politics (2026)

Last updated March 2026 · By Nick Hall, firearm enthusiast who follows DoD procurement contracts and defense industry dynamics

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How the Military Buys Its Guns

Military firearm procurement sounds straightforward: figure out what you need, test some options, buy the best one. In reality, it’s a labyrinth of political maneuvering, multi-billion dollar contracts, congressional lobbying, and procurement timelines that can stretch a decade or more. The gun that wins a military contract isn’t always the best gun. It’s the gun attached to the best bid, the most political leverage, and the manufacturer willing to meet production requirements that would make your head spin.

That said, the process does produce some genuinely excellent firearms. The M4A1, the Sig M17/M18, and the new XM7 are all products of military procurement, and civilians can buy semi-auto versions of all of them. Understanding how the military buys guns helps explain why your AR-15 exists, why the Sig P320 replaced the Beretta M9, and why “mil-spec” doesn’t always mean what you think it does.

The US Military Procurement Process

The Department of Defense follows a structured acquisition process for major weapons systems. For small arms, it typically works like this:

1. Identifying Requirements

A branch of the military identifies a capability gap or a need to replace aging equipment. This usually comes from operational experience: soldiers in the field reporting that their current weapon doesn’t meet their needs. The Army’s decision to replace the M9 pistol started with years of complaints about the Beretta’s size, weight, and the 9mm’s perceived lack of stopping power (which modern ammunition has since addressed). Requirements documents spell out what the new weapon must do: caliber, weight limits, accuracy standards, reliability thresholds, and environmental testing criteria.

2. Request for Proposals (RFP)

The military issues an RFP to the defense industry, inviting manufacturers to submit their designs. For the Modular Handgun System (MHS) competition that produced the M17, companies like Sig Sauer, Glock, Beretta, FN, and Smith & Wesson all submitted entries. The RFP specifies the technical requirements, testing protocols, delivery timelines, and cost constraints. This is where the political games begin, because defense contractors spend millions on submissions and lobbying to influence the process.

3. Trials and Testing

Submitted firearms go through extensive testing at military facilities. This includes accuracy testing, reliability testing (tens of thousands of rounds in various environmental conditions), drop testing, salt spray corrosion testing, mud and sand exposure, extreme temperature operation, and ergonomic evaluation by soldiers. The testing phase can take years. The MHS trials ran from 2015 to 2017, and the NGSW (Next Generation Squad Weapon) program took even longer.

4. Contract Award and Production

The winner gets a contract that typically spans 10 to 20 years and involves hundreds of thousands of units. Sig Sauer’s MHS contract was initially worth $580 million for up to 500,000 pistols. The NGSW contract is worth potentially $4.7 billion. These contracts include not just the firearms but ammunition, spare parts, maintenance support, training, and ongoing upgrades. Losers often protest the decision (Glock protested the MHS award), which can delay deployment by months or years.

Famous Military Procurement Programs

The M16 Adoption (1960s)

The adoption of Eugene Stoner’s AR-15/M16 is one of the most controversial procurement stories in military history. The Air Force adopted the AR-15 in 1962 after impressive testing. The Army initially resisted, partly because the Ordnance Department had invested heavily in the M14 and didn’t want to admit it was inferior. When the M16 was finally rushed to Vietnam, it was issued with the wrong ammunition, without cleaning kits, and with soldiers told the rifle was “self-cleaning.” The result was catastrophic jamming that got soldiers killed. The rifle was eventually fixed, but the procurement failures surrounding its adoption remain a cautionary tale. See our complete history of the AR-15 for the full story.

Modular Handgun System: Sig M17/M18 (2017)

The MHS program replaced the Beretta M9 after over 30 years of service. Sig Sauer won with their P320-based M17 (full-size) and M18 (compact), beating entries from Glock, Beretta, FN, and S&W. The Sig offered a modular chassis system that allows different grip sizes and configurations, a manual safety (required by the military), and strong overall test scores. Glock protested the award, arguing that Sig’s pricing was unrealistically low, but the protest was denied. The civilian P320 is virtually identical to the military M17/M18. Our M18 review covers the civilian version.

Next Generation Squad Weapon: Sig XM7 and XM250 (2022)

The NGSW program is the most ambitious small arms procurement in decades. It replaces both the M4A1 carbine and the M249 SAW with new weapons chambered in a completely new cartridge: the 6.8x51mm (.277 Fury). Sig Sauer won again with the XM7 rifle and XM250 automatic rifle, paired with a hybrid brass/steel cartridge case that generates significantly higher chamber pressures (and velocities) than standard 5.56 NATO. The program aims to defeat modern body armor that 5.56 can’t reliably penetrate. It’s controversial, with critics arguing the new round has too much recoil and the weapons are too heavy. Only time and combat deployment will tell if it works.

Russia’s Procurement Failures in Ukraine

Russia’s invasion of Ukraine exposed catastrophic procurement failures. The Russian military literally ran out of AK-pattern rifles at points during the conflict, forcing some units to deploy with ancient Mosin-Nagant bolt-action rifles pulled from storage. Supply chain corruption, decades of underfunding, and a failure to anticipate the scale and duration of the conflict left Russian forces short of everything from rifles to optics to body armor. It’s the ultimate example of what happens when procurement fails.

Why the Military Doesn’t Always Get the Best Gun

Here’s the uncomfortable truth: military procurement doesn’t always select the best weapon. Several factors consistently produce suboptimal outcomes.

Lowest bidder wins. Military contracts overwhelmingly go to the lowest compliant bidder. This means the gun that barely meets specifications at the lowest price often beats the gun that exceeds specifications at a higher price. “Mil-spec” literally means “meets the minimum military specification,” not “best available.” As our military vs civilian firearms guide explains, many civilian firearms actually exceed mil-spec in quality.

Political influence. Defense contractors employ armies of lobbyists and make strategic decisions about where to build factories based on which congressional districts will vote to fund their programs. A manufacturer that builds rifles in 12 different states has 24 senators with a vested interest in keeping that contract alive, regardless of whether a competitor makes a better product.

Risk aversion. The military bureaucracy is inherently conservative. Adoption of genuinely new technology is slow because the consequences of failure are measured in lives, not quarterly earnings. This is why the M4/M16 platform has been the standard rifle for over 60 years despite multiple attempts to replace it. The NGSW program may finally succeed, but previous programs (ACR, OICW, XM8) all failed to unseat the AR-15 family.

Scale requirements. The military needs hundreds of thousands of identical weapons produced to exact specifications with full parts support for decades. Small manufacturers making superior products in limited quantities can’t compete with industrial giants like Sig Sauer, FN, and Colt who have the capacity to fulfill those contracts.

NATO Standardization: Why It Matters

NATO’s Standardization Agreements (STANAGs) require member nations to adopt common ammunition standards so allied forces can share supplies in the field. This is why NATO countries use 5.56x45mm for rifles, 7.62x51mm for machine guns, and 9x19mm for pistols. The standardization simplifies logistics enormously in joint operations but also limits innovation, because adopting a new cartridge requires agreement across the alliance.

The NGSW program’s 6.8x51mm cartridge is interesting precisely because it breaks from NATO standardization. Whether NATO allies will follow the US to a new cartridge or stick with 5.56 remains to be seen. For context on the calibers involved, see our most popular rifle calibers guide and the best 5.56/.223 ammo breakdown.

Civilian Versions of Military Guns

One of the most interesting side effects of military procurement is that competition winners almost always produce civilian versions. The military contract pays for the R&D, the tooling, and the factory capacity, and the manufacturer then sells semi-auto versions to civilians at a profit. This is why you can buy:

• AR-15 (civilian M4/M16): Our best AR-15 rifles guide, best under $1,000, and best under $500
• Sig P320/M17/M18 (civilian MHS winner): Our M18 P320 review
• Beretta 92FS (civilian M9): Our best Beretta pistols guide
• Glock 17/19 (used by military/LE worldwide): Our best Glock pistols guide
• AK-pattern rifles (civilian AK-47/AKM): Our best AK-47 rifles guide
• Barrett .50 BMG (civilian M82/M107): Our best .50 BMG rifles and Barrett rifles guides
• FN SCAR (civilian Mk 16/17): A premium battle rifle available commercially

For a full comparison of how military and civilian versions differ, see our military vs civilian firearms guide. And for a look at what militaries around the world carry, see our most popular military small arms and best military sniper rifles guides.

Related Guides

• Military vs Civilian Firearms: Key Differences
• Most Popular Military Small Arms
• 10 Best Military Sniper Rifles
• The Complete History of the AR-15
• Eugene Stoner: The Man Who Invented the AR-15
• 14 Guns That Changed the World
• The History of Firearms
• Firearms in Warfare
• What Is the National Firearms Act?
• America’s Most Popular Rifles

The Bottom Line

Military firearm procurement is where engineering meets politics, and politics usually wins. The process produces some excellent weapons (the M4, the M17, the M2), but it also produces decades of delays, billions in wasted money, and sometimes dangerous compromises. Understanding how the military buys its guns explains a lot about why the firearms market looks the way it does, and why the civilian versions of military guns are often better than the originals.

FAQ: Military Firearm Procurement

Frequently Asked Questions