Including all wz. Which was your favourite GUN?

Let me start from my favourite. I was using WSP swarm (100 mag). Then switched to fjx horus. Made me like a beast. What was your's?
Favourite BR - STG 44 Sniper - MORS (it felt like holding a futuristic sniper)

(Note: I started playing from mw1 but become daily player from mw3)