Ghosts,

With the help of your feedback, we noticed issues with the Skorpion SMG, GSh-18, Saiga-12 and KARD unlocks.
The team worked on a fix, and this fix is now ready. As it needs changes in the code, the fix will be included in the next title update (coming soon).
For your information, the unlock mechanism will change - those weapons will be automatically unlocked after completing certain missions in the campaign:
  • GSh-18: Mission 3
  • Skorpion SMG: Mission 5
  • KARD: Mission 8
  • Saiga-12: Mission 11