This new version electric airsoft gun has metals gears not just a metal gear box. Many China AEG's will have a metal gear box but contain plastic gears which can wear out quickly when trying to produce speeds in the 300 fps range. Has a fixed stock, mock silencer, and selector switch for full-auto, semi-auto and safety modes. Comes with rechargeable 8.4V NiCad battery pack and charger. Action: Semi-Auto and Full-Auto Caliber: 6mm - .12g plastic bb's Magazine Capacity: 50 rounds Rate of Fire: 500 rounds per minute Muzzle Velocity: 330 fps .12g bb's; 280 fps .2g bb's Made in China: Golden Bow Dimensions: 29" L x 8-3/4" H Body Material: Gun Weight: 4 lbs. Shipping Weight: 8 lbs.