I am not sure if I can ask this here or not but nothing ventured etc

I am struggling to find somewhere that sells the bottle for the Gunpower Stealth. Mine has been damaged by my son when he cross-threaded the connector when attaching it to the body. The whole valve assembly has now come off the bottle completely. I may have to get a new bottle if I can't find a gun shop able to repair mine but despite some interweb trawling I haven't found anyone selling the bottle separately.

Any leads would be greatly appreciated. Please point me in the right direction if you can.

Thanks,
Graham.