If you're looking for the best in ergonomics, action and accuracy, your search ends with the Thunder. A serrated pistol grip and slide puts this heavyweight weapon into its own category. * CO2 to Green Gas Conversion Compatible Magazine - 82020C12 * Semi-Automatic * Non-Blowback * Hop-up * Propulsion: CO2 * Weight: 1.5 lbs. * Length: 8.5" * FPS .12g BB: 350 * Mag Capacity: 15 * Extra Mag Number: JPM1026 or 82020C12 * Body: Plastic Returns: Only items with manufacturer defects will be considered. All returns must have a return authorization (RA) number. Please call before you return any item to obtain a return authorization number. You must place the return authorization number clearly on your return label. All returns must be made within 30 days of shipment to be considered. ANY RETURN THAT DOES NOT HAVE A RETURN AUTHORIZATION NUMBER WILL BE REFUSED. All authorized returns will be issued a refund/replacement/credit at the discretion of Palco Sports, Inc.