User blog comment:BlueChoco/Your choice for Mark II weapons/@comment-3161482-20110913060509/@comment-1906486-20110915041915

PSG-1 Mark II, hardly many noticeable improvements. PSG-1 MOD Mark II was pretty noticeable though, scope mag increase and changed scope to a Dragunov scope.

Skorpion Mark II was a damage boost, nothing else noticeable (to me) changed in any other way. Damage is really negated too much, due to S3 is really used to help control it's wild recoil. Never checked the rares, but I'm betting a huge boost somewhere.. never really had a clue though.