I dont know about firing line but i wouldnt recommend Sprawl wilds. Im not saying is bad, i bought it and like it but its a little off a common shadowrun as they take the runners outside cities. One mission would be way better if done after completing Copy Cat killer and on a Silver Platter.
I would do recommend Season 4: Back in business. Its short, its nice and it gives you a mini intro to seatle. To use in on 5th search for the weapons equivalents in 5th and set the limits for the NPCs, im running the whole season 4 that way on 5th