Unlike ATK’s screw-in PGK nose, the M982 Excalibur is delivered as a complete 155mm artillery shell, with GPS guidance and pop-out fins. Its arrival on the battlefield made artillery relevant again in counter-insurgency scenarios, while offering lethal counter-battery fire in high-end scenarios.
Excalibur’s integrated design makes it more expensive than screw-in fuze/guidance options like PGK, but it’s also more accurate. As electronics, GPS, and hence screw-in systems improve, Raytheon needs to stay ahead. The Excalibur Ib has improved accuracy and cost, but next steps involve new guidance systems that would dramatically expand Excalibur’s capabilities and market.