The M4 Custom is the custom variant of the M4A1. Due to its smaller dimensions, it has been re-classed as an engineer weapon; as such it sports a good rate of fire, excellent damage, decent accuracy and a high effective range. Its damage multipliers to the head and limbs are also increased, allowing it to suit a wide variety of playstyles. It is effective at close range.
Its unique Strike Cookie Cutter Compensator increases recoil smoothness and penetration while decreasing damage drop; its HALO MiniVert Grip V1 decreases spread, recoil, and reload duration; its MOD Billet Grip V1 decreases spread and recoil; and its Vortex Venom Sight gives it faster zoom.