User blog comment:Deathmanstratos/New personalization packs, skin packs, and voice over packs announced for Call of Duty: Ghosts/@comment-208.54.38.251-20140419023619/@comment-3967954-20140420100431

I guess they just wanted to go with popular weapons rather than realistic choices. Treyarch don't exactly take weapon choice seriously.

I did find it pretty amusing that Dr. Clarke had several G11 prototypes lying around throughout Kowloon in the campaign.