In 1997, Primex Technologies was spun off from the Olin Corporation. (Also see John Merrill Olin).
January 6, 2000 --- Primex Technologies, Inc. (Nasdaq: PRMX) said it has entered into a new Strategic Alliance Agreement with Raytheon Company (NYSE: RTNA, RTNB) under which Primex Technologies will act as a preferred strategic supplier to multiple divisions of Raytheon Company. Executives from Primex Technologies and Raytheon will serve on a joint strategic council to identify existing and next-generation products to be manufactured by Primex and to share business information in order to develop and expand new opportunities. 
November 27, 2000 --- General Dynamics Corp. announced that it would buy Primex Technologies Inc., a manufacturer of munitions and missile components for US$344 million. In addition, General Dynamics would assume approximately US$170 million of Primex's debt. The transaction is expected to close in the first weeks of 2001. 
In 2002, Aerojet (a GenCorp, Inc. company) acquired General Dynamics Space Propulsion Systems.  This does not include the "Ordnance and Tactical Systems" (formerly Primex), leaving the ammunitions with GD.