A holster support assembly for use by a user wearing a belt, the assembly being adjustable for both drop and cant, the assembly comprising: a belt support that is configured to engage and be supported by a user's belt, the belt support having a track, the track including walls having a varying wall thickness and portions defining a plurality of detents, said detents defining a plurality of drop positions spaced apart along the track to enable the user to set the drop position of the holster; a slider supported on the belt support for sliding movement along the track between the plurality of drop positions; a holster mount supported on the slider and movable along the track with the slider between the plurality of drop positions, the holster mount configured for supporting a holster; and a fixed length securing assembly that slides along the track and holds the holster mount to the belt support; the holster mount being selectively engageable with and disengageable from the slider, the holster mount being rotatable relative to the slider about an axis when disengaged from the slider to enable the user to set the cant position of the holster relative to the belt support; wherein the track has a lower section, including the drop positions, and the holster mount cannot be disengaged from the slider when the slider is on the lower section of the track; wherein the track has an upper section where the track walls are thinner than the track walls of the lower section and does not include the drop positions, at which the holster mount is disengageable from and movable away from the slider to enable rotation of the holster mount relative to the slider so as to enable the user to adjust the cant position of the holster relative to the belt support. a belt support that is configured to engage and be supported by a user's belt, the belt support having a track, the track including walls having a varying wall thickness and portions defining a plurality of detents, said detents defining a plurality of drop positions spaced apart along the track to enable the user to set the drop position of the holster; a slider supported on the belt support for sliding movement along the track between the plurality of drop positions; a holster mount supported on the slider and movable along the track with the slider between the plurality of drop positions, the holster mount configured for supporting a holster; and a fixed length securing assembly that slides along the track and holds the holster mount to the belt support; the holster mount being selectively engageable with and disengageable from the slider, the holster mount being rotatable relative to the slider about an axis when disengaged from the slider to enable the user to set the cant position of the holster relative to the belt support; wherein the track has a lower section, including the drop positions, and the holster mount cannot be disengaged from the slider when the slider is on the lower section of the track; wherein the track has an upper section where the track walls are thinner than the track walls of the lower section and does not include the drop positions, at which the holster mount is disengageable from and movable away from the slider to enable rotation of the holster mount relative to the slider so as to enable the user to adjust the cant position of the holster relative to the belt support.