Type: BB Rifle. Manufacturer: BARRA. Model: BARRA 400e. Materials: Mostly Metal with some plastic. Weight: 7.5 pounds (3.4 kilograms). Length: 42.25 inches (1073mm). Propulsion: AEG (with Deans Connectors). Action: Semi & Full Auto. Ammunition Type: 4.5mm steel BB's. Ammunition Capacity: 50 rounds. (1000 shots per battery charge Aprox.) FPS: 410fps. Rate of Fire: 550+ rounds per minute in full auto (depending on battery voltage). I have to say the rate of fire on the BARRA 400e Full Auto AEG 4.5mm BB Rifle using a 7.4 volt battery is rather slow even compared to other Airsoft AEG Full Auto Airguns but I still yet have to test it out using a brand new 11.1 volt Lithium battery so I do expect the rate of fire to improve a noticeable amount. Stay posted for that update video. Even with the slower rate of fire from the BARRA 400e this gun is awesome, it is really accurate and the velocity stays super consistent since CO2 cool down is not a factor. The mostly all metal construction and overall quality is very good and the fact that this is really the first commercial AEG 4.5mm Steel BB Rifle makes that alone a great reason to pick one up. Read full article here: www.replicaairguns.com/posts/2023/1/6/barra-400e-aeg-full-auto-bb-rifle-field-test-review Buy the BARRA 400e AEG Full Auto BB Rifle in Canada: https://www.replicaairguns.ca/barra-400e-full-auto-50rds-bb-rifle# Buy BARRA Airguns in the US: https://www.replicaairguns.us/barra-airguns