KJW Para ordinance dumping gas after first shot

[yanhchan]

So my friend's KJW para is dumping gas after one shot I checked the slide and the internals and all the workings are smooth. The mag isn't leaking nor is the valve sticking. So I'm thinking the spring isn't holding enough force for the second hammer strike to be effective. But then when I double cocked it to make sure the slide went all the way back, it still dumped gas.