Type: BB air pistol. Manufacturer: UmarexUSA. Model: HK 45. Materials: Metal and plastic (Polymer). Weight: 1.4 pounds (635 Grams). Barrel: 4.5 inches, non-rifled. Propulsion: 12 gram CO2. Action: Double action only. Ammunition Type: 4.5mm steel BB's. Ammunition Capacity: 20 round metal stick magazine. FPS: 400 fps claimed. For a rather low cost CO2 4.5mm steel BB pistol, the Umarex HK 45 has a lot going for it! It is fully HK Licensed with a metal slide and metal parts where you want and need it. The accuracy and power are both good and even the double action trigger is very usable. Sure the Umarex HK 45 Metal Slide CO2 BB Pistol is a pretty basic gun with few moving parts but then again simple is sometimes better in terms of reliability. If you are an HK fan and want a low cost well made and good performing BB pistol then checkout the Umarex HK 45. Read full article here: https://www.replicaairguns.com/2015/6/29/umarex-hk-45-metal-slid Buy the Umarex HK45 BB Pistol in Canada: https://www.replicaairguns.ca/heckler-and-koch-hk45-177-co2-bb-pistol Buy the Umarex HK45 BB Pistol in the US: https://www.replicaairguns.us/heckler-and-koch-hk45-177-co2-bb-pistol