Wh64 is slow, and not exactly a great gun on the fire mode. Ak74 is alright. Sten is alright, but ak74 I would say is definately better. Dual Rafficas are the best. There someone like shipkas but automatic, and much less freeze. They also have higher spread. I saw someone I was sparring with take down an full Gang spar area with just dual rafficas. He went 7vs2 and destroyed them (or course with me, the person was recurvez if your wondering)

But yes, 1 raffica would be okay, but 2 is amazing with much better accuracy.
Hope that helped