Butterfly Knife (With instructions) from BrickLink Studio [BrickLink]
Lego Butterfly Knife 3.0, The second time to modify this toy knife with the technic long bricks, It's really worth to do this again , Much stronger and smooth when flipping, And more stable in knife ...
LEGO Butterfly Knife - Black Ops 3
Steam Community :: Video :: Lego Butterfly Knife Tutorial!