I reckon recoil control and power/range are the main things needed for Warzone. Monolithic suppressor is good for these things and keeping you hidden. Bigger barrel, plus grip and fully loaded perk.For Warzone - does mobility count for much on your ARs? I like my M4A1 setup, but unsure on underbarrel attachment. Whether the commando or tactical foregrip (i.e mobility vs control) is better. I've put in the hours on multiplayer only recently to unlock all the attachments for the guns I'm comfortable with so far, so not many hours on Warzone to really judge my setups.
I use a PKM for Warzone as it drops feckers dead quick and actually isn’t bad for recoil. Bit of ADS improvement and you’re laughing.