The M1156 Precision Guidance Kit (PGK), formerly XM1156, is a U.S. Army-designed precision guidance system to turn existing 155 mm artillery shells into smart weapons.[2] The prime contractor was Alliant Techsystems – later merging with Orbital Sciences Corporation to form Orbital ATK, in turn being taken over by Northrop Grumman and renamed Northrop Grumman Innovation Systems – and the industry team includes Interstate Electronics Corporation.[3] By April 2018, more than 25,000 PGKs had been produced.[4]
^ abcdJanes (7 February 2023), "Northrop Grumman M1156 Precision Guidance Kit", Janes Land Warfare Weapons: Ammunition, Coulsdon, Surrey: Jane's Group UK Limited., retrieved 6 March 2023
^XM1156 Precision Guidance Kit (PGK). Global Security.
^"ATK Precision Guidance Kit (PGK)". ATK.
^Orbital ATK is expanding to prepare for what they predict will be a surge in DoD buys of more lethal munitions. Defense News. 12 April 2018.
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