HK USA started 2004
Virginia, New Hampshire, Georgia
- 1948, three former Mauser engineers, Edmund Heckler, Theodor Koch, and Alex Seidel, salvaged machine tools and started in the vacant Mauser factory
- December 28, 1949 changed name to Heckler & Koch GmbH
- 1956 G3 battle rifle
- 1969 as the MP5
- 1974 – diversified
 – Defense and Law Enforcement
 – Hunting and Sports
- 2004 – HK416
- 2005 – Heckler & Koch Defense Inc
 – U.S. affiliate of Heckler & Koch
 – Sterling, Virginia
- 2007 – new facility in Ashburn, Virginia
- 2008 – HK begins to build pistols in the USA
 – HK45 first HK officially ‘Made in the USA’
- 2008 Newington, New Hampshire factory opened
 – 70,000 square foot
 – to build HK MR556 and HK MR762
- locations in
 – Ashburn, Virginia
 – Newington, New Hampshire
 – Columbus, Georgia
- 2017 Closed Newington and moved to Georgia
 – 50,000 square-foot