Medicament delivery device

A medicament delivery device comprising:

• a syringe body configured to receive a medicament therein, the syringe body comprising a distal end and a proximal end;
• a plunger located in and moveable relative to the syringe body;
• and
• a plunger rod assembly extending from the proximal end of the syringe body and configured to move the plunger longitudinally within the syringe body,
• wherein the plunger rod assembly comprises a plunger barrel and a plunger rod,
• wherein the plunger barrel is in direct contact with the plunger and configured to cooperate with the plunger rod,
• wherein the plunger rod is moveable relative to the plunger barrel from a first position, in which the plunger rod is maximally extended from the plunger barrel, to a second position, in which the plunger rod is distally away from the first position, to set a specific dose of the medicament to be delivered that is less than an amount of the medicament in the syringe body,
• wherein the syringe body comprises a protrusion extending radially inward from an inner surface of the syringe body, the protrusion being received in a guide channel of the plunger barrel such that the plunger barrel is rotationally fixed to the syringe body.