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Navy’s MK 38 Sees First Caliber Upgrade in 30 Years

currentdefencenews.com > News > Naval Platforms > Navy’s MK 38 Sees First Caliber Upgrade in 30 Years

February 6, 2026
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The US Navy has introduced the MK 38 MOD 4, replacing the legacy 25mm cannon with a 30mm Bushmaster II and integrating air-burst ammunition along with upgraded EO/IR targeting systems to enhance shipboard defense.

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