Railgun sound effects for weapons that charge, then crack. A rising electrical whine as it powers up, then a hard snap as the round leaves. Brutal. They sit among heavier sci-fi artillery and energy weapons, with shields and interface bleeps for the suit or ship doing the shooting, and plenty of variations so a long firefight never repeats.
A railgun works on screen when the charge and the shot feel connected. The longer the build, the bigger the crack should be. Designers usually lay an electrical whine under a supersonic snap and finish with a Bullet Impact far away. These give you charge and crack ready to go, with chain guns and artillery for the rest of the battle.
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