Saturday night my vss was shooting fine.   Tried using it Sunday and the gun fires but the bbs literally spit out the barrel then drop instantly. Putting my hand over the barrel and no air comes out, sounds horrible when it fires, like metal hitting metal.   Opened the hop up to see if there was any issues, bucking is ripped, this maybe the issue? Can't tell if the nub needs replacing or not.   Or is it anything to do with air compression in the gearbox?