GBB pistol problem

[davidverrall]

So, I have a kwa kz75. If I use ultra gas I get half a mag and the gas is done. If I use green gas I could get about 2 mags worth but it doesn't load the BBs correctly so I get about 2 then it stops working and I end up with a load of BBs jamming in the barrel. Any suggestions on what I can do to stop this?

 

[Guest]

Is it unmodified, clean with no broken or damaged parts? That’s where I always start, strip it down completely and inspect everything very closely. 

Is it designed to be used with a CO2 mag?

 

[davidverrall]

I have stripped it, cleaned it and applied a small amount of silicone lube. This made no difference. It's designed to use green gas so I have no idea why it won't work?

 

[Guest]

Something must be worn or broken somewhere, is the loading nozzle return spring OK?

 

[davidverrall]

It has two which both look perfectly fine and if I pull it by hand it snaps back quickly

 

[Guest]

So it’s leaking gas through the firing circuit, if it’s not the cycle sticking.

You our need to find out where

 

[davidverrall]

I was going to replace the main piston seal to start, I'll see what happens when I do that. Thanks for your help, it's much appreciated