Vindz Vega

So a gun that fires 420fps stock (according to https://www.fire-support.co.uk/product/asg-4-inch-co2-dan-wesson-revolver-pistol-silver ) has had its fps increased? is this still even classed as an airsoft gun? or is it now a funky sniper rifle?  If the latter, surely you know the fps, kinda important to skirmish? though a lack of a hop up on this model would make it a pretty poor sniper