Type: Airsoft. Manufacturer: King Arms. Model: Colt M4A1 Metal AEG. Materials: Metal & Nylon. Weight: 6 pounds. Barrel: 15 inches, metal. Propulsion: AEG Action: Semi/full auto, single action. Ammunition Type: 6mm Plastic BB (recommended .20 gram plus). Ammunition Capacity: 300+ round magazine. FPS: 450. This Field Test Review focusses primarily on how the AEG M4A1 performs in feet per second velocity using .25 gram plastic Airsoft BB's, its accuracy in both semi and full auto and of course my comments on it's shoot-ability and overall performance. Read full article: https://www.replicaairguns.com/2012/4/6/king-arms-colt-m4a1-metal-aeg-airsoft-rifle-field