Hazar!!
I found out what the problem was, I took apart my friends Ion and switched parts round on my gun to pin point the leak...
It was coming from the breach... it was the ONLY bit o-ring you get with your ion when new.. replaced that and BAM! no leak.
I called SP twice and spoke to them, both times they said a leak was normal!! ( up to 1000psi or something per day)... They obviously no jack **** about their products.
Anyway, Cheers all
Josh.