Season 2 Hardware 5 Attachments

If you got to the M87A1 Shotgun and go to Attachments and Rounds, you can unlock a 5RND SPEEDLOADER, it says "Unlocked through Challenge SEASON 2 HARDWARE 5" Season 2 Hardware challenges currently only go up to Challenge 3, no 4 or 5, now there is only a week or so left of Season 2, is this a Typo or a Bug? I don't know but was just hoping someone could look into it please.