You mean the upper and lower disassembly? There is a pin on a spring on the underside of the back upper. You have to push it flat and slide the upper forward (magazine removed of course). Then the pin will lock into a second hole, so you have to get something skinny to push through the bottom of the lower to push the same pin in again, then slide it forward some more. Finally, pull the charging handle back halfway and to finally push the 'upper' off entirely.

I'm not familiar with that particular gun but with the snow wolf which seems to be just a copy of everything else, you need to pull the cocking handle all the way back and then the bottom (receiver) half of the gun is able to slide backwards from the upper (receiver) part. you got any pics of what you are stuck with?