Fully Charged Airsoft does an unboxing of the EMG Daniel Defense MK18 & M4A1 SOPMOD Block II made by CYMA. The Special Operations Peculiar MODification (SOPMOD) Block II, an accessory system for the M4A1 carbine, features a full-length monolithic rail system and a heavier free-floating "SOCOM" profiled barrel for improved accuracy and heat mitigation.