Railguns were developed by China, they are capable of cutting through 23 inches of armor as claimed by China.
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Edited by Molag Bal: 12/20/2014 3:31:49 AMBolters fire explosive bolts containing antimatter which annihilate any matter in contact Shields of a standard space marine are capable of deflecting almost all kinetic weapons and projectiles
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Railguns are no exception, they are no ordinary kinetic weaponry. http://halo.wikia.com/wiki/Z-90_Photonic_Coalescence_Emitter/Aegis