You won't needa skin
Hey there are resources available to u that you are missing. From the hive you could put together ur ak47 carrying zombie on ur own.
ok so first take this skin from morbid, it belongs to villager male. It's the zombie.
Then go to the models and pick up these two, the ak is by kofi_banan, the villager model is by .KC
Now import those into your map IMPORTANT NOTE: if you are alrdy using both the villagerman skins for other things, you will have to convert the animated villagerman model to .mdl then change the model's blpfile to the skin you are importing.
Now we get internal, take the villagermanmodel and put it on a unit. go into the object editor and set the Art-RequiredAnimationNames to "work"
get the spell Sphere and change settings:
Art-missile art: to none.
Art-target: to the ak47 model
Art-TargetAttachmentPoints: to RightHand
Art-TargetAttachments: to 1
Stats-Cooldown: to .01
Text-Name: AK47
Give the Zombie the ability u just edited and now you have a zombie that carries an ak.
Tested all this and it works just fine