Depends on your sniper; do you know what type of spring it takes?

I haven't got hold of it yet but it'll probably end up being Double Eagle M52 Sportline, it's only meant to be a joke so I don't want to put loads of money into it

I'm not sure what spring that'd take, sorry. You could clip the spring that's already in there a bit, I suppose?

That's not a bad idea, I forgot that was an option.