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A crew‑served or vehicle‑mounted electromagnetic weapon that fires a continuous stream of hypervelocity projectiles using railgun technology. Rail machine guns offer sustained fire rates of thousands of rounds per minute, with each projectile capable of penetrating light armor. They are imagined as replacements for conventional heavy machine guns on vehicles, ships, and aircraft. The challenges are extreme: barrel wear (the rails erode after a few hundred shots), power supply (generators or massive capacitor banks), and cooling (the system generates enormous heat). Still, the potential for a weapon that can engage targets at extended ranges with minimal drop and wind drift drives ongoing research.
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