The U.S. government in early June denied an appeal by firearms maker Glock to reconsider choosing its rival Sig Sauer's P-320 pistol worth up to about $580 million.

The Army originally chose the gun in January, but Glock appealed the decision, leading to the ruling by the Government Accountability Office.

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Sig Sauer is a privately held German firm. It will manufacture the guns in its U.S. subsidiary's New Hampshire plant.

The Army M9 Beretta pistols have been standard issue since 1985 when the U.S. Army selected it. It eventually became the standard sidearm for all branches of the U.S. military.

Before that, the standard issue sidearm was the Colt 1911 45 caliber pistol.

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Editors' pick: Originally published June 7.