Its already a known problem, however not being able to use a flash suppressor on this isn't a major game breaking bug so it won't be fixed until the next update most likely.
I am missing items too missing green laser coyote and pka EA please fix
EA won't really be able to do anything about it, because they are not game developers - game is developed by DICE, which is responsible for in-game fixes.
As @MorningTimeCloud mentioned, issue with missing Mare's Leg attachments (which is caused by too low number of weapon battlepacks) is already known, and if it will be fixed, it will happen as part of a game patch. There is no official announcement about it yet but, judging from past release dates, I wouldn't be surprised if it shows up around mid-March.
