Type: BB air pistol. Manufacturer: ASG. Model: Bersa Thunder 9 Pro. Materials: Mostly polymer with some metal internal parts. Weight: 1.2 pounds (530 Grams) Barrel: Metal non-rifled. Propulsion: CO2 x 1. Action: Semi auto non-blowback, double action only. Ammunition Type: 4.5mm BB's. Ammunition Capacity: 19 round magazine. FPS: 400. As you know, my preference is more towards the all metal guns with lots of working parts, full size drip out magazines and blowback action. The problem with these types of realistic airguns, is that they can be expensive and sometimes a bit temperamental with all the working parts designed more for realism and less for simplicity. Generally speaking the more realistic the gun the more of a sacrifice is made to give up things like power, CO2 efficiency and even accuracy. The ASG Bersa Thunder 9 Pro is made to look like the real steal version but it does not try to replicate it mechanically and so as a functional BB pistol it will work very well, yet give you the look and feel a real 9mm Bersa Thunder 9 Pro. Read full article here: https://www.replicaairguns.com/2013/10/2/asg-bersa-thunder-9-pro-co2-bb-pistol-table-top-review.html Buy the Bersa Thunder 9 Pro in Canada: https://www.replicaairguns.ca/asg-45mm-bersa-thunder-9-pro-co2-bb-pistol/ Buy ASG Airguns in the US: https://www.replicaairguns.us/asg-45mm-bersa-thunder-9-pro-co2-bb-pistol/