I have gotten both PPSH and Mark 3, the PPSH is good with headshots, and is even better Pack a Punched. It does burn through the ammo though. I like the Mark 3 a lot and it is a very good weapon. It does not burn through the ammo. I got the FFAR and Shadow Claw on a firesale. I didn't have either very long as I traded them in. But the limited time I had the FFAR was a good one. In the lower rounds it does really well with head shots. I used the Shadow Claw for a little and it is not a good zombie killer weapon. Only reason I would keep it was so that I could PAP it and take advantage of the revive feature.