Unity2D - moving an object around the player based on mouse input

[simple skiff]

So, I currently have this script:

using UnityEngine;
using UnityEngine.InputSystem;

public class BaseWeapon : MonoBehaviour
{
    private PlayerInputActions Controls;
    private PlayerInput input;

    private void Awake()
    {
        this.Controls = new PlayerInputActions();
        this.Controls.Player.RotateWeapon.performed += ctx => this.RotateHandler(ctx.ReadValue<Vector2>());
    }

    private void RotateHandler(Vector2 mousePosition)
    {
        Vector3 Position = Camera.main.ScreenToWorldPoint(mousePosition);

        this.gameObject.transform.position =
            this.gameObject.transform.parent.transform.position + 
            (Position - this.gameObject.transform.parent.transform.position).normalized;
    }

    private void OnEnable()
    {
        this.Controls.Enable();
    }

    private void OnDisable()
    {
        this.Controls.Disable();
    }
}

And I'm trying to make it so the child object will rotate around the parent object in a circle. I tried clamping the radius of the movement, but I got insanely weird results. This is what it currently looks like:

https://dl.dropboxusercontent.com/s/tmcjkod07cjza0a/Unity_b0HTo3JVvl.mp4

Does anyone have any suggestions for making this work? Thank you in advanced.

[cedar dew]

Don't know how optimum it is but you can make a parent of weapon and if you want radius to be let's say 1
Set local position of weapon to (1,0,0) and rotate the parent around z axis

[simple skiff]

Maybe I'm misunderstanding, but wouldn't that rotate the parent (the player) in this instance? Right now I'm trying to rotate the child around the parent

[cedar dew]

Heirarchy

Player -> gun parent -> gun object with offset

We rotate gun parent