Administration mechanism for a medicament delivery device

An administration mechanism for a medicament delivery device, where the administration mechanism comprises:

• a movable sleeve comprising:
• an outer surface,
• a follower located on the outer surface, and
• a lock positioned on a flexible tongue and extending radially from the outer surface;
• a delivery member cover comprising:
• a longitudinal axis;
• a distal portion comprising a distally extending leg;
• a guide surface located at a distal end of the leg;
• and
• an arm that proximally and circumferentially extends from an edge of the leg at an obtuse angle relative the longitudinal axis, where the delivery member cover is configured to be axially displaceable relative to the movable sleeve between a first position, a second position and a third position;
• and
• a first resilient member that exerts a proximally directed biasing force on the delivery member cover during movement of the delivery member cover from the first position to the second position and to the third position,
• wherein an inside surface of the leg engages and pushes the lock and tongue radially inward as the delivery member cover moves relative to the moveable sleeve, and
• wherein the guide surface is oblique with respect to the longitudinal axis of the delivery member cover and comprises an end face that is slidably engaged with the follower when the delivery member cover moves from the first position to the second position.