Shooting mechanism used in my Lego M1A2 Abrams tank. The parts list is missing a common rubber band, this is used to power the bolt that fires the projectiles. Red circles/lines are used to indicate location of parts, and blue is used for the mounting of the rubber band in the last step.

The operation of the mechanism is in the video below of my M1A2 Abrams at 1:03 there is a animation of it's operation at normal speed, and at 1/5th speed.




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This MOC also has a LEGO Digital Designer file available: 3D Model