The R72 not only holds 375 6mm airsoft BBs, but also uses a rapid feed dial at the base of its magazine to provide continuous feed. Its heavyweight design helps to simulate the realistic feel of a fully automatic rifle. For increased distance and accuracy, the R72 features a hop up system. This airsoft rifle also features the option to choose either a semi or fully automatic shooting style at a velocity of up to 275 feet per second. Each R72 comes complete with battery, charger and bottle of 500 6mm airsoft BB.