The indefinite-delivery/indefinite-quantity award is for five years and is worth a maximum of $95 million.
ATK said Wednesday the mission-specific ammunition would be produced at its facility in Anoka, Minn.
"This contract is the result of a focused effort to expand our business in an important strategic market," said Ron Johnson, president of ATK's Security and Sporting group. "Our core ammunition technology provides the ideal platform for meeting this important customer need."
ATK said it used its core capability of ammunition technology development to create a customized solution to meet the needs of the FBI. The duty load is based on Federal Premium's 62-grain Tactical Bonded projectile, which excels at barrier penetration. The training ammunition features 55-grain and 50-grain bullet options.
Production of the duty round was tailored to the specifications of the FBI and is under way. Deliveries are expected to begin this year, the company said.