Ksc Airsoft Is My Airsoft KSC G18c Broken?

Is my airsoft KSC G18c broken? - ksc airsoft

Hello guys. I wonder, is My Broken KSC G18c? I have just today, and I had no green gas or silicone oil for it. So I went to the MAG and pulled back the slide to see how it works. It is locked, and I hit the slide back a release for him. I made a couple of times with and without the magazine. Then he slid down on the black tab just above the trigger, then a new user account (I have tried to understand what it was). Now when I pull back the slide not locking. It just comes and goes forward. Why is it or is it something to fear? Thank you.