<Page>
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
--------------------------
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported): October 26, 2001
ALLIANT TECHSYSTEMS INC.
(Exact name of registrant as specified in its charter)
DELAWARE 1-10582 41-16726904
(State or other jurisdiction of (Commission (I.R.S. Employer
incorporation or organization) File Number Identification No.)
5050 LINCOLN DRIVE
EDINA, MINNESOTA 55436-1097
(Address of principal executive office) (Zip Code)
Registrant's telephone number, including area code: (952) 351-3000
600 SECOND STREET N.E.
HOPKINS, MINNESOTA 55343
(Former name, former address and former fiscal year if changed from last report)
<Page>
Item 5. Other Events.
On October 25, 2001, the Registrant issued a news release announcing
that it had signed a non-binding letter of intent with Blount International,
Inc. to acquire its ammunition business as described in the news release. The
text of the news release is attached hereto as Exhibit 99 and incorporated
herein by reference.
Item 7. Financial Statements and Exhibits.
(a) None.
(b) None.
(c) Exhibits.
EXHIBIT NO. DESCRIPTION OF EXHIBIT
----------- ----------------------
99 Text of news release dated October 25, 2001
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.
ALLIANT TECHSYSTEMS INC.
Date: October 26, 2001
By: /s/ Perri A. Hite
Name: Perri A. Hite
Title: Secretary