Hydraulic compression stop with necked-down cylinder tube

A damper assembly comprising:

• a main tube filled with a working liquid;
• a rod disposed at least partially within the main tube;
• a piston assembly connected to the rod and slidably disposed within the main tube, the piston assembly dividing an interior of the main tube into a rebound chamber and a compression chamber;
• a hydraulic compression stop assembly including a piston sleeve disposed in the compression chamber and attached to the piston assembly;
• the main tube including a shoulder and a necked-down portion extending from the shoulder and having a reduced diameter smaller than a diameter of the main tube opposite of the shoulder, wherein the necked-down portion is configured to receive the piston sleeve;
• and
• a tubular wall disposed around the necked-down portion and defining an external flow channel outside of the main tube;
• and
• wherein the necked-down portion defines a plurality of axially-spaced holes, each providing fluid communication between the compression chamber and the external flow channel.