NATO Standardizes Fabrique Nationale’s (FN) 5.7x28mm Caliber

FN America 57 Pistols
FN America announced that their 5.7mm cartridge has been adopted as NATO standard. IMG FN America

U.S.A. -( FN America, LLC is pleased to announce that the FN-designed 5.7x28mm caliber has been standardized by NATO. The caliber was designed in the late 1980s for use with the FN P90 and FN Five-seveN pistol. With almost three decades of trusted use, the FN 5.7x28mm continues to leverage the groundbreaking design to improve range, accuracy, and terminal performance from small arms. As NATO adds the FN 5.7x28mm to their standard small-caliber ammunition portfolio, FN proudly continues its long legacy of small arms innovation as it enhances service to civilians, law enforcement, and militaries across the globe.

In a continuous effort to promote interchangeability of all small-caliber ammunition used by allied armed forces, NATO has recently finalized the standardization process of the FN-designed 5.7x28mm caliber by approving the standardization agreement (STANAG) 4509.

The 5.7x28mm caliber is now integrated into the Multi-Caliber Manual Of Proof and Inspection (AEP-97) and joins the standardized NATO small-caliber ammunition portfolio, along with the 9x19mm NATO, the 5.56x45mm NATO, the 7.62x51mm NATO, and the 12.7x99mm NATO (also widely known as the .50 caliber).

As a NATO standardized caliber, the 5.7x28mm provides armies with the guarantee of interchangeability between ammunition from different manufacturers and operational efficiency in weapons of this caliber.

Coming after the FN-designed 5.56x45mm and 7.62x51mm calibers which were standardized by NATO in 1957 and 1981 respectively, this new NATO standardization confirms FN Herstal’s leading position as a designer and manufacturer of small caliber weapon-ammunition systems. It also reinforces the company’s strategy and dedication to providing modern-day armed forces and security forces all across the world with the best performing and efficient small-caliber ammunition concepts and designs.

To learn more about FN’s 5.7-chambered firearms or other FN products, please visit

About FN America, LLC:

The World’s Most Battle-Proven Firearms | FN America, LLC, is a U.S. subsidiary of FN Herstal, S.A., a global leader in the development and manufacturing of high quality, reliable firearms for military, law enforcement, and commercial customers worldwide. Headquartered in McLean, Virginia with manufacturing operations in Columbia, South Carolina, FN America is passionately committed to providing its customers with a portfolio of products, training, and support services under the FN brand name that enhance their performance and safeguard their lives.

For more information, visit us at or follow us on Facebook, Twitter and Instagram.

Most Voted
Newest Oldest
Inline Feedbacks
View all comments

Maybe now I’ll be able to get ammo for my Ruger 57.


How will this compete with the 6mm ARC that is slated to replace the .223 that I hear the US Army is adopting for the AR platform?


If I join NATO can I get some 5.7x28mm ammo?


For that, you’ll have to move to the EU.


And wear bright clothes, a ponytail, and speak with a lisp!

American Patriot

So who really gives a sh*t about what nato has to say???