Quick question about immersive mode.

I just started playing on immersive mode and on extreme (except for stamina and a couple other things). Im liking it, but i read that you are supposed to break down weapons to modify the weapons you want to use. I cant seem to figure out how to breakdown anything tho.

Any insight would be appreciated. Also, any other tips/potential headaches to avoid are more than welcome...such as skills that are super helpful for this mode and ones to avoid.

I am really liking it so far for the most part, even tho im super duper early still. Im on one of the first missions "No Way Out", just taking my time moving toward the objective area.

TLDR; How do you break weapons down in immersive mode, or is that mechanic not even a thing. Any other tips welcome.

Im playing on ps5 fwiw. Tia!