HFC Slide Problems

[dengar]

I have a problem with my HFC Super Spectre v2 gbb. It is a brand new gun and I am using green gas. When I cock the slide back with no clip in it, it slides smoothly and then I pull the trigger and I hear the hammer fall. When I insert a clip the slide is very hard to pull back and when it gets all the way back and lock so when I hit the slide release it goes back smoothly and a round is chambered. Once the first round is shot the slide goes back about an inch and it has to be pushed back to fire again.