Batman Grappling-Hook Pistol by michfreak on DeviantArt

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Batman Grappling Gun by Paulp3D on DeviantArt

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New 52 - Silver Batman Grappling Gun by SomethingGerman on DeviantArt

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Grapple Gun by Corven55 on DeviantArt

Batman begins grappling gun by Hardreplic on DeviantArt

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