A medicament delivery device comprising: a body; a container carrier slidably disposed in the body; and a sleeve slidably coupled to the container carrier, wherein the container carrier includes at least one third leg (7.6), wherein the third leg (7.6) is biased radially outward, wherein the sleeve includes at least one sleeve leg (6.3) adapted to radially abut the at least one third leg (7.6) when the sleeve is in a retracted position relative to the body to prevent the at least one third leg (7.6) from deflecting radially outwards, and wherein when the sleeve is in a extended position relative to the body the at least one third leg (7.6) is adapted to deflect radially outward and axially abut the at least one sleeve leg (6.3) to lock the sleeve in an extended position relative to the body, wherein the container carrier includes at least one second leg (7.5) biased radially outward, wherein the body includes at least one axial stop adapted to axially abut the at least one second leg (7.5), to prevent the carrier from moving in a distal direction relative to the body, wherein the container carrier includes at least one first leg (7.2) having a first protrusion (7.3) and a second protrusion (7.4) proximal of the first protrusion (7.3), wherein the sleeve includes a collar (6.1) configured to: distally abut the first protrusion (7.3) to prevent the sleeve moving in the distal direction; and during movement of the sleeve in a proximal direction, to abut the second protrusion (7.4) to stop movement of the sleeve in the proximal direction, wherein the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) are coupled to a periphery of a proximal portion (7.1) of the container carrier, and the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) extend in the distal direction from the proximal portion (7.1). a body; a container carrier slidably disposed in the body; and a sleeve slidably coupled to the container carrier, wherein the container carrier includes at least one third leg (7.6), wherein the third leg (7.6) is biased radially outward, wherein the sleeve includes at least one sleeve leg (6.3) adapted to radially abut the at least one third leg (7.6) when the sleeve is in a retracted position relative to the body to prevent the at least one third leg (7.6) from deflecting radially outwards, and wherein when the sleeve is in a extended position relative to the body the at least one third leg (7.6) is adapted to deflect radially outward and axially abut the at least one sleeve leg (6.3) to lock the sleeve in an extended position relative to the body, wherein the container carrier includes at least one second leg (7.5) biased radially outward, wherein the body includes at least one axial stop adapted to axially abut the at least one second leg (7.5), to prevent the carrier from moving in a distal direction relative to the body, wherein the container carrier includes at least one first leg (7.2) having a first protrusion (7.3) and a second protrusion (7.4) proximal of the first protrusion (7.3), wherein the sleeve includes a collar (6.1) configured to: distally abut the first protrusion (7.3) to prevent the sleeve moving in the distal direction; and during movement of the sleeve in a proximal direction, to abut the second protrusion (7.4) to stop movement of the sleeve in the proximal direction, wherein the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) are coupled to a periphery of a proximal portion (7.1) of the container carrier, and the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) extend in the distal direction from the proximal portion (7.1). wherein the container carrier includes at least one second leg (7.5) biased radially outward, wherein the body includes at least one axial stop adapted to axially abut the at least one second leg (7.5), to prevent the carrier from moving in a distal direction relative to the body, wherein the container carrier includes at least one first leg (7.2) having a first protrusion (7.3) and a second protrusion (7.4) proximal of the first protrusion (7.3), wherein the sleeve includes a collar (6.1) configured to: distally abut the first protrusion (7.3) to prevent the sleeve moving in the distal direction; and during movement of the sleeve in a proximal direction, to abut the second protrusion (7.4) to stop movement of the sleeve in the proximal direction, distally abut the first protrusion (7.3) to prevent the sleeve moving in the distal direction; and during movement of the sleeve in a proximal direction, to abut the second protrusion (7.4) to stop movement of the sleeve in the proximal direction, wherein the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) are coupled to a periphery of a proximal portion (7.1) of the container carrier, and the at least one first leg (7.2), the at least one second leg (7.5) and the at least one third leg (7.6) extend in the distal direction from the proximal portion (7.1).