Autoinjector for automatic injection of a medical product into an injection site

An autoinjector for automatic injection of a medical product into an injection site, the autoinjector comprising:

• a housing extending along a longitudinal axis (A) and configured to receive a medical container having a barrel defining a reservoir for containing a medical product, said barrel having a distal end provided with an injection needle and an opened proximal end,
• a power pack arranged inside the housing for expelling the medical product from the medical container, the power pack including a plunger rod configured to extend through the opened proximal end of the barrel for pushing a stopper arranged inside the barrel, the plunger rod being axially movable between an initial position and an injection end position distally located with respect to the initial position, and
• resilient adjustment means arranged between the plunger rod and the barrel for compensating clearances between the plunger rod and the barrel;
• wherein the resilient adjustment means are arranged on a plug attached to a distal end of the plunger rod;
• and
• wherein the plunger rod comprises a distal opening for receiving a connection portion of the plug and at least one axial slot configured to receive the resilient adjustment means.