We already have AKS-74U in the game, but we just don't have an option to attach grenade launcher to it. The design of BS-1 is quite different from other GLs in the game. It would be very cool to see it again in such an enjoyable game.
I was thinking of this model since the original Insurgency. I really hope Sandstorm could introduce it for the first time in the series.
If you want to know how it might look in a game