A medicament container carrier (1) comprising a proximal section (10) having a first diameter, a distal section (9) having a second diameter less than the first diameter, and at least one resilient beam (5) arranged in the proximal section (10) and having a beam head (7) protruding radially to form a third diameter. The at least one beam (5) has a non-deflected position in which the third diameter is less than the first diameter and a deflected position in which the third diameter is substantially equal to the first diameter.
