We can only speculate, and I understand how a slug works. The problem is that, if I am to understand the archetype Bungie is trying to create, is that it will have the capacity to one-shot at a longer range than even Felwinter's, while having all of the other traits of a shotgun (high aim assist, good handling). This effectively makes it a better handling No Land Beyond with more aim assist and better perks, considering the maps in Destiny almost entirely cater to close quarters engagements. Getting a headshot is, again, [i]not[/i] difficult at all, particularly with a weapon which handles similarly to a shotgun.