A leak on my S410

[Outandabout]

Hi all
My S410 has developed a leak, it is slowly leaking air down the barrel. However if i pull the bolt back slightly - not far enough to cock the gun the leak stops, also if i cock the gun and push the bolt home the leak also stops.
It has got me baffled Has anybody any ideas how to sort out the leak.

Cheers Kevin

[Roger5]

Hi all
My S410 has developed a leak, it is slowly leaking air down the barrel. However if i pull the bolt back slightly - not far enough to cock the gun the leak stops, also if i cock the gun and push the bolt home the leak also stops.
It has got me baffled Has anybody any ideas how to sort out the leak.

Cheers Kevin

Hi Kevin, it's the firing valve, you could just screw the the pot in a bit see if that stop it, or replace the firing valve assembly, to be honest I would replace the firing valve. Rog

[Outandabout]

Thanks rog. I will replace it all