The FAMAS F1 EVO differs from the original due to its built in MOSFET, allowing worry freechanges of batteries. This feature enables you to upgrade to 11.1 V LiPo batteries of ahigher capacity ( Mah ) and dump rate ( C ). Another desirable feature is its ability to easilychange its muzzle velocity without removing the spring, which gives you the option toprecisely increase or decrease in energy, up to 5 m/s. Excellent when playing in differentscenarios. The body of the gun is a bulpup design made from reinforced nylon fibre polymer.It is unique in the fact that this was the world's first Automatic Electric Gun ( AEG ). Stayingtrue to its roots it has a modern version of the original Version 1 gearbox.The set includes the replica, 300 round Hi-cap magazine, battery charger and manual.