English: The M2E2 Quick Change Barrel (QCB) Kit is an enhancement to the M2 .50 Caliber Machine Gun offering Soldiers increased performance as well as new features and design improvements that make it easier and safer to use.

Upgrades such as the QCB system, fixed headspace and timing configuration, flash hider, and removable carrying handle will increase the performance of the battle-proven M2 and can be fitted to existing M2HB weapons.

The QCB Kit, when installed on the M2 (to be renamed the M2A1 once it is type-classified), speeds target engagement and improves survivability and safety by reducing the time required to change the barrel and eliminating the timely procedure of setting headspace. The flash hider reduces muzzle flash, making the M2 less detectable in darkness.