AIP 140% Enhance Loading Nozzle Spring For Marui 5.1/ 4.3 - Pack of 3
Nozzle sticking? Feeding issues? BBU chewed up your nozzle spring?
Then these are what you need... stronger nozzle springs will eliminate any sticking nozzle problems and ensure it's returned fast enough for the next bb.
These are a consumable part and do wear, it's always best to have some with you on game day.