How do you mechanically and battle sight zero a m4?

To mechanically zero an M4, start by ensuring the weapon is unloaded, then adjust the front and rear sights so they are aligned with the rifle’s bore. Use a bore sighting tool if available for precision. Next, to battle sight zero, shoot a group at a target from a supported position at 25 meters, then adjust the rear sight based on where the rounds impact, typically aiming for a point of impact that aligns with the center of mass of a human-sized target at 300 meters. Once adjustments are made, confirm the zero at longer distances if necessary.