This is happening on some of my guns and I’m stumped I’m running a emg Helios m4 with a kythera and a prowin in it, and another m4 with a Vfc receiver, a polarstar jack and a max pro. After about half a mag or so I’m having to constantly increase the hop up to get bbs to fly right, I’m using pts epm1s’s in both of them. Both set to run about 400 FPS with a .25