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Building a real, working grappling gun – Pt.1
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How to make THE BATMAN Grapple Gun! (Cardboard DIY)
How to make THE BATMAN Grapple Gun! (Cardboard DIY)
DIY Batman Grappling Hook! TKOR Batman Grapple Gun Project!
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Grapple Gun, Batman Wiki
Next Up for SEALs: Upgraded Batman-Style Grappling Hook Gun