M249 SAW

The US military's 5.56mm squad automatic weapon since 1984 — a belt-fed, quick-change-barrel light machine gun derived from the Belgian FN Minimi, fielded in every major American conflict and now being succeeded in close-combat squads by the 6.8mm XM250.

Overview

The M249 Squad Automatic Weapon is a gas-operated, air-cooled, belt-fed light machine gun chambered in 5.56×45mm NATO. Derived from the Belgian FN Minimi, it was adopted by the US military in 1984 as the standard squad-level automatic weapon and has since been exported to more than 75 countries. The M249 fires from an open bolt, features a quick-change barrel for sustained fire, and uniquely accepts both M27 disintegrating-link belts and standard STANAG magazines — giving the gunner the ability to fall back on rifle magazines when belts are exhausted. After four decades of service across every major US ground campaign, the M249 is now being supplemented in US Army and Marine Corps close-combat squads by the 6.8×51mm XM250/M250 under the Next Generation Squad Weapon program.

Development

FN Herstal developed the Minimi in the late 1970s and early 1980s, with the design credited to Ernest Vervier, the same engineer behind the FN MAG general-purpose machine gun. The goal was a lightweight, belt-fed automatic weapon that could keep pace with rifle squads while delivering sustained suppressive fire. The Minimi entered production in 1982 and was quickly entered into the US Army's Squad Automatic Weapon trials, which sought a replacement for the Vietnam-era M16A1 with its automatic rifleman role, according to the Small Arms Defense Journal. The Minimi won the competition, and the US adopted it as the M249 in 1984. FN America, based in South Carolina, has been the primary US military production source. An initial product-improvement program in the late 1980s and early 1990s addressed early reliability complaints, yielding the M249 PIP (Product Improvement Program) variant that became the baseline for all subsequent configurations. The weapon's STANAG magazine feed — a deliberate design choice rare among belt-fed machine guns — was included at the US Army's insistence as a logistical hedge, per the Wikipedia reference entry.

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