CMMG Charging Handle Zeroed Ambidextrous 7075-T6 Aluminum for AR-15 Platform Perfecting the proven design of the first generation CMMG ambi charging handles, the CMMG ZEROED ambidextrous charging handle was engineered with handles that are less intrusive to users while still providing easy operation. Constructed from rugged 7075 aluminum for AR-15 platform firearms, the ZEROED ambi charging handle was made to withstand any charging method while providing superior grip, even with gloves or optics so you can always charge your AR with confidence.