NATO Standardizes FN’s 5.7x28 mm Cartridge

by
posted on March 4, 2021
nato-standard.jpg

The FN-designed 5.7x28 mm caliber has been officially standardized by the North Atlantic Treaty Organization (NATO). Its development began in the late 1980s when, “Jean-Paul Denis and Marc Neuforge, designers at FN Herstal, started from scratch to design a new cartridge and then a platform to launch it,” according to Dave Campbell’s story for American Rifleman. “The cartridge had no parent case. What FN put forth was a 1.138" long case with a rebated rim, with a 35-degree shoulder that launched a .22-cal. bullet weighing from 23 to 31 grains: the 5.7x28 mm.” Today a variety of commercial firearms are chambered for it, including those from FN USA—the FN P90 and FN Five-seveN pistol.

NATO standardization integrates the 5.7x28 mm into the organization’s Multi-Caliber Manual of Proof and Inspection (AEP-97) and adds it to the portfolio of standardized NATO small-caliber ammunition, along with the 9 mm NATO, the 5.56 NATO, the 7.62 NATO and the 12.7 NATO (widely known as .50 BMG).

FN’s no novice to getting cartridges accepted and adopted on an international scale. It designed the 5.56 and 7.62 cartridges standardized by NATO in 1981 and 1957, respectively. The designation provides armies with the guarantee of interchangeability between ammunition from different manufacturers and operational efficiency in like-caliber firearms.

NATO was officially formed in 1949 and one of its earliest missions was the creation of ammunition standards that allow member nations to safely comingle supplies if necessary. There was no such agreement in place during World War II, when allies arrived at the front with a potpourri of cartridges with varying dimensions and pressures. As the Cold War heated, the goal became logistically critical.

With almost three decades of trusted use, the FN 5.7x28 mm continues to grow in popularity. “Nearly 50 nations use the 5.7x28mm…including the United States, where no fewer than 19 law-enforcement agencies, both federal and state, are using it,” Campbell explains. “The cartridge and the guns chambered for it seem to have found favor with special forces and counter-terrorist operators.”

Latest

 American Revolution painting
 American Revolution painting

The Shot Heard Round The World: The Arms & Events Of April 19, 1775

April 2025 marks 250 years since the momentous events at Lexington and Concord—the opening salvos of the American Revolution. Today, exhaustive research of primary accounts and surviving firearms and artifacts give us a clearer picture of what really happened.

Gun Of The Week: Browning Citori 825 Field

Learn about Browning's latest version of the famed Citori shotgun, the Citori 825 Field, in this week’s range video.

The Armed Citizen® April 18, 2025

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

"The Shot Heard Round The World:" 250 Years Later

On April 19, 1775, simmering tensions between Great Britain and her colonists erupted into warfare with the engagements at the Massachusetts towns of Lexington and Concord.

Watchtower Firearms Re-Organizing

Watchtower Firearms, a veteran-owned firm based in Texas filed for Chapter 11 Bankruptcy protection in late February 2025 to restructure and re-organize its financial structure.

The Road To Revolution: 250 Years Later

The militiamen who stood in defiance on Lexington Green are the first who fired upon the British regulars, but the road to revolution was paved long before gunfire erupted on that cold April morning in Massachusetts.

Interests



Get the best of American Rifleman delivered to your inbox.