Type: Blowback CO2 BB Pistol. Manufacturer: Distributed by Umarex. Model: HK VPN. Materials: Metal & Polymer. Weight: 1.42 pounds (644 grams). Barrel: 4.13 inches, metal non-rifled. Propulsion: CO2 x 1. Action: Semi auto single and double action trigger. Ammunition Type: 4.5mm steel BB's. Ammunition Capacity: 18 round drop out full size metal magazine. FPS: Claimed 350 The Umarex HK VP9 CO2 Blowback BB Pistol reminds me a lot of the ISSC M22 CO2 Blowback BB Pistol in terms of how it operates, they both have that same full size dop out metal magazine that has that moving nozzle for more efficient CO2 usage. Both BB guns also both have that “half” or reduced cycle blowback operation which again probably increases CO2 efficiency and power. The Umarex HK VP9 CO2 Blowback BB Pistol looks and feels great in the hand and has a nice snappy blowback operation with easy to use sights and a smooth trigger. I just wish I was able to get a little bit tighter grouping during my field test shooting video but sometimes it’s just me, sometimes it can just be that specific gun. Let me know how yours performs for you? Read full article here: https://www.replicaairguns.com/2018/11/8/umarex-hk-vp9-co2-blowback-bb-pistol-table-top-review