❔Issue with IK, Left Hand, ADS

This problem typically occurs if there's some scaling applied to either IK dircetly or weapon-related points.

Reason 1 - MasterIK scale

Make sure that MasterIK game object (child of the head bone) does not have any scaling applied:

You can also check other IK game objects, like RightHandIK, etc. But most likely the issue is with the MasterIK object.

Reason 2 - Weapon Scale

If your weapon prefab uses scaling, causing the Aim Points to be scales as well, the aiming will be broken.

How to fix?

Make sure that your weapon is not scaled directly, instead, scale the gun mesh only #step-2-create-pivot-and-aim-points.