While the obvious answer to this question is that the best M4A1 loadout in Warzone is largely subjective, we're pretty certain that the M4A1 class and setup we've got is the best all-round build for the popular AR. This weapon is great for newcomers as it features a modest amount of recoil alongside an impressive time to kill speed.
The M4A1 is slowly becoming a viable option in Warzone Season 5, offering everything you need for the battle royale: accuracy, range, a fast rate of fire, and the potential to strap on a 60-round magazine. Given the number of players on Verdansk, you'll want to equip yourself with as many bullets as you can.
Of course if you're new to Warzone or Modern Warfare's multiplayer then we're afraid that you'll need to do a lot of grinding to earn all of the attachments that really make this rifle so powerful. The M4A1 setup for Warzone we've got below offers decent damage per second over mid to long-range fights, without making the gun unwieldy in close-up gun battles.