Please identify if possible

[Birdie]

Can anyone here identify this really old sniper?
I know it has a mag holding 6 plastic shells but it also has a long rectangular stick mag you’d put on the left side.
If anyone recognises it please tell me what it is

 

[Hatchet]

UHC Super 9, I believe.

 

[Cannonfodder]

Edit: ignore what I posted earlier, I think Hatchet is right

 

[Birdie]

Thank you so much for your help it was a Super9 or a W700 & luckily my local store still has the side mag & blanking plate part as to not use the under mag