The F-4J's I flew in the Marines didn't have a gun, either.
We did have a really big radar, compared with the USAF F-4E's, which did have a gun.
You can't have everything. And if you are the Marine Corps, you not only make-do with what you have; you do it better than anyone could have expected.
I'm sure they'll do just fine.
I'm sure they'll also wish they had a gun. Just like we did.
It has a gun pod that can be installed on the CL...