Need help my weapon is not unlock

[nonrublaew]

Product: Battlefield V
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number 960
Enter RAM memory size in GB 8
Are you using any software with an overlay? No
Which part of the game is the issue happening in? Multiplayer
Which part of the mode? Conquest
Please select your region Asia
On which server did this happen?
When did this happen? (dd.mm.yy hh:mm)
Summarize your bug My weapon is now unlock only M1A1
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? It dont give a M1A1!!
What happens when the bug occurs? I dont have M1A1
What should be happening instead? I have a M1A1 at assault level 5

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only M1A1 is not unlock pls help my assault level 7 and it dont give M1A1 for me