Key features include: - .68 caliber system - Semi-automatic (optional upgrade for semi/burst/auto) - 18 round detachable magazine - Optional 200 round hopper adaptor - Internal Flexi-Air system - All metal construction - M4 style charging handle - Removable carry handle - M4 Style front sight - M4 Style hand guard - 14" Tactical Barrel - Works with CO2/Compressed Air/ HPA/Nitrogen from all tank sizes - Maximum range: 300 feet - Effective range: 150 feet - Velocity 200-325 fps (adjustable): Recreational Version - Velocity 350-450 fps (adjustable): Military and Law Enforcement Version