G36 Hop unit.

[Qlimax]

Hi,

I need a little help as I am now at a loss, I have put a new hop unit into a friends G36 all is fitted fine and back in place but as soon as I put a mag in it empties the bb's into the hop unit and not sure why this is.

any suggestions would help.

Thanks

 

[Hibernator]

Did you put the hop arm and nub back in properly?