Re: Challenges to unlock items are not completing.

They changed the requirements of these challenges. They lowered the amount you have to do to some of these challenges. So you have the same problem as I have. I had already made progress beyond that lowered requirement, so now ALL of my open challenges are locked which should be now completed. Danger close, Assault, Close quartes etc etc. 

UPdate:

At least the Assault Expert 2 closed after I started doing it again and I can start doing the final step. Can't confirm yet the others. I'll post an update when I test those too.

At least for me, all those challenges are now open and I got the guns etc also. I just went through the guns etc in one match and after that the lockdown cleared.