Best way to make a simple Aim down sights?

Currently I'm working on a weapon and I'm wondering how do I easily make a Aim Down Sight. I don't need any details such as camera tweening animation, I just want the camera to focus on the gun's AimPart.

while wait() do 
    if hold == true then

        cam.FieldOfView = 30
        cam.CameraSubject = AimPart
        cam.CameraType = Enum.CameraType.Attach
    elseif hold == false then
        cam.FieldOfView = 70
        plr.CameraMode = Enum.CameraMode.Classic
        cam.CameraSubject = char

    end
end

Is there any better way to improve this? Thanks~