Kris ‘FaZe Swagg’ Lamberson came up with this “one-burst” setup that allows you to dispatch your enemies before they can even react.
The Harbinger D20 is one of the best ways to reduce the M16’s bullet belocity and damage range and it is essential to set up the one-burst build.
The FTAC Ripper 56 Underbarrel gives players some recoil reduction, making the M16 easier to control at range.
Optics are a matter of personal preference but you cannot go wrong with the Aim Op-V4 which is one of the cleanest sights in the game.
For your ammo, you want to use the 5.56 High-Velocity Rounds which reduces damage range but increases bullet velocity noticeably.