strykerles

We have Cyma MP5 Rentals, not the K version but it might be similar.
Only ever removed the slider by the way not the handle itself but found this for you.

"The cocking handle is disassembled by removing the upper receiver from the handguard and sticking a long philips head screwdriver down the FRONT IRON SIGHT housing. You need to remove the handguard pin as well in order to disassemble the front iron sight and access the screw to remove the charging handle."

To remove the cocking Slider & Spring:
Take out the push pins circled in the photo (probably have to take the top right one out too on the K version) and slide the grip and gearbox backward out of the receiver, attached to the gearbox should be a slider bar with a spring on it.
Inside the rest should be the slider, tilt it backward to remove the slider (should just fall out.

Apparently there's also a handle pin you have to punch out??

Thanks for that. I'll have a look