Expandable stock not sticking

[Shaun Haynes]

On my new gun (nurpol) the  extending  stock doesnt stick in place. 

Is there anyway  of tightening  the screw that meant to hold it in place 

 

[Samurai]

Bring it back under warranty.

 

[Shaun Haynes]

I sorted it was 30  sec  fix in the end