Umarex H&K Licensed VP9 GBB Pistol

This is very much like my actual VP9 firearm. It's why i got it, so I could run drills and practice cheaper.When I first got it, the mag would shoot maybe 2-6 rounds and dump all the gas. I watched several videos, I was positive I was filling properly. Turns out I was, but not one of the videos or online info suggested "prepping" a new mag. Then I found ONE SINGLE video that suggested spraying the gas valves with silicone spray. After spraying and running the mag twice, I could easily rapid fire the full mag, without gas loss.So thankful for the video, it saved my experience of this gun!