Did u try to switch it off and on again?
11/10/22
Paint the gun yellow, problem solved.
11/10/22
Try to boil it.
11/10/22
Boiling and citric acid.
11/10/22
Buy Boltex from Würth this is the best rust remover ever.!!!
11/10/22
Pour fluoroantimonic acid over it and spray it with water
11/10/22
Sand blast it afterwards
11/10/22