Geonox Airsoft reviews the Sig Air Proforce MCX Virtus HPA that comes with a 1,000EUR price tag... "In this video we look at the Sig Sauer Proforce MCX Virtus HPA. HPA stands for High Pressure Air. The MCX Virtus has a nice, wide, aggressive handguard. That combined with the chic PDW stick is an eye-catcher. Inside is a Wolverine Inferno Gen 2 Spartan Engine."