Has anyone any experience with this type of hop up? It’s a golden eagle m4, I have installed a new hop rubber and bucking, but the bb’s still curve upwards. (It was doing it before installing new rubber) pew was a pre owned purchase. Apart from that it’s great fun and reliable. I have attached a pic of the hop assembly. I’m fairly sure I’ve installed the new hop and bucking correctly. Is there anything else I need to look out for? I’m using .20 bb’s do I need heavier weight? Thanks