I bought one of this pistols for home security, so I had not fired the pistol yet, last night around 2 AM, someone or something broke my window so I chambered a luger 9MM into the chamber, after the police came and check the area, I tried to pull back the slider to remove the live round and it won't retract ,it's stuck, will it be safe to fire that round to see if the Action releases the empty cartridge ?

I have a Kel-Tec and know several others that do too. I have never heard of that happening before. I would DEFINATELY find out from Kel-Tec if it is safe to fire like that before firing. But to me it seems that it wouldn't be a problem.

Did you try to pull the slide back really hard?

Yes Kel Tec 9MM Law enforcement Hollow points will not fit Kel Tecs, the bullet does not go in totally in the seat and the extractor won't grab it, you can use any 9mm Luger except those hollow points. Go figure literature doesn't say anything about it, but Kel Tec is aware of it.