KWA MP9 jamming issue

[Diaboliclion]

hi all, i have recently had a new problem with my mp9 that means that after the trigger is pulled, it is extremely difficult to pull back the slide.
I have realised that this is due to the striker that hits the bolt not being able to be pushed all the way back down as it comes into contact with a piece of metal. what can I do?
please help. thanks