I've heard LB assault, which is also my personal favorite. The others are clunky and obstructive. Although, the middle one for this week has a decent second scope, but I'd go for LB Assault. It improves range a little too. Persistence helps with targets that are further away but once you get used to the recoil, you'll know how to guide the gun. I used Silimar's Wrath back when the high rate of fire models weren't so great, and you didn't need persistence on that baby.

The thermal sight isn't bad