Specifications: Construction ............................................. T6061 Aluminum, Nickel-Plated Brass Barrel Length ........................................... 17" Barrel Construction (.177/4.5mm) ............ Stainless Steel (6mm) ........................ Brass Length ...................................................... 22.5” Width ........................................................ 2.25” Height ....................................................... 9.5” Weight (Empty) ......................................... 7 lbs 9 ounces Caliber ...................................................... .177 (4.5mm) or 6mm Hopper Capacity (.177/4.5mm) .................. Approx. 9,600 Rounds (6mm) ............................. Approx 7,200 Rounds Ammunition Type (.177/4.5mm) ................. Metal .177/4.5mm BB’s (6mm) ............................ Airsoft Plastic 6mm BB’s or Steel 6mm BB’...