Not sure why I am getting low FPS on my 4.3 hi capa it’s shooting about 260fps with a .20 gram bb. Someone help. Could it be the hopup the nozzle does not stick at all. Here is the parts list. 5.1 length 6.03 inner barrel Sanctus customs outer barrel Maple leaf 70 degree deception bucking Gaurder enhanced hopup chamber Gaurder nozzle with tm internals Am bbu 125 percent recoil spring Cow cow short stroke kit Nine ball mag seals