If you have a look in the AmrA section in the forum, you will see a section about the Weapoins PBO
Follow instructions i and everyone has posted to editing this and enjoy,
But when editing this, 6/10 times when joining a server you will see a messege and so will everyone els saying modified weapons.pbo file
But you can skip that and download the Hack wesker made and use the Inc ammo on the rocket luncher and have a rocket machine gun,
a note on that, is there anyway to remove to recoil on the rocket luncher, as was causing soe hassle on some servers last night an i could not control it lolol