Objects are drawn behind others

Greetings, I use a second camera to draw certain objects on top of others such as guns and bullet marks to prevent them from going through the wall and to prevent z-fighting issues. It works well and does what it is intended to do, but I have one problem. Because the bullet marks are drawn on top of all other objects, these bullet marks will always be visible, even when behind other objects. This is of course not something I would want. So how do I stop these bullet marks from "rendering-through" other objects? Thanks!