Type: BB - Airsoft pistol. Manufacturer: KWC. Model: Mac11 M11. Materials: Mostly ABS (Plastic). Weight: 1.2 pounds (531 Grams). Barrel: Smooth bore with fixed hop-up. Propulsion: CO2 x 1. Action: Semi auto, double action only. Ammunition Type:4.5mm steel BB's - 6mm plastic Airsoft. Ammunition Capacity: BB 39 rounds - Airsoft 26 rounds. FPS:BB 394 fps/ 120 m/s - Airsoft: 499 fps/ 152 m/s. Too be honest when I first saw the box for the KWC Mac 11 M11 CO2 BB - Airsoft Pistol I was a bit excited, that was until I opened it up and found out I was looking at a pretty much all plastic gun with few working parts and no blowback operation. But after holding it and giving this air pistol a good look over I have to say I am warming up to it a bit more now. After all it is the first Mac 11 M11 4.5mm steel BB pistol that I know of and it 100% looks the part so if you are looking for a replica Mac 11 then this will fill that purpose for sure. Even though it is almost all ABS plastic, this airgun feels solid seems to be really well made. The steel and metal stock is a nice addition and so would have been a metal magazine but overall for a low cost replica BB and Airsoft shooter you do get your moneys worth. Read full article here: https://www.replicaairguns.com/2015/11/7/kwc-mac-11-m11-co2-bb Buy the KWC Mac 11 M11 4.5mm BB Gun in Canada: https://www.replicaairguns.ca/kwc-mac11-m11-bb-nbb-gun Buy the KWC Mac 11 M11 6mm Airsoft Gun in Canada: https://www.replicaairguns.ca/kwc-mac11-m11-airsoft-nbb-gun