A fin lock assembly 12 for locking and unlocking missile fins 20 includes a piston 34 movable along a piston axis 44 between a locked position for preventing a fin from rotating and an unlocked position for allowing the fin to rotate. The fin lock assembly includes a camshaft 46 rotatable between a locked position and a relatively-rotated unlocked position about a cam axis 50 that is transverse the piston axis. The camshaft has an eccentric portion 66 connected to the piston such that rotation of the camshaft between the locked position and the unlocked position moves the piston between its corresponding locked and unlocked positions. The fin lock assembly includes a torsion spring 72 connected to the camshaft to bias the camshaft toward its unlocked position. A latch mechanism 100 holds a plurality of camshafts in their locked positions and simultaneously releases the camshafts to release their fins.