How can i make viewport scope system

  1. What do you want to achieve?
    I want to make viewport-frame scope that compatible with fe gun kit
    This is the example:

  1. What is the issue?
    It dosnt work when I use a bunch of cctv camera system model
    This is the current one:
  1. What solutions have you tried so far?
    I had using free cctv system model but it can’t use on the viewmodel