A medicament delivery device may comprise a medicament chamber configured to hold a medicament, a plunger configured to move relative to the medicament chamber to expel the medicament from the medicament chamber, a pin configured to move from a first pin position wherein the pin prevents movement of the plunger to a second pin position wherein the pin allows movement of the plunger, an actuation assembly configured to move the pin from the first pin position to the second pin position, and a needle coupled to the medicament chamber. The medicament may flow through the needle from the medicament chamber to a user. The actuation assembly may be configured to automatically move the pin after a predetermined time delay.
