Working LEGO 4-stud Pistol + Free Instructions - YouTube
LEGO MOC LEGO MPX Submachine Gun (Working) by THE_MOC_CHANNEL | Rebrickable - Build with LEGO
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How to build LEGO guns that work!
Lego Gun Instructions - YouTube
Review - The BrickGun Book - Jeff Boen - BrickNerd - All things LEGO and the LEGO fan community