It can be done. In most cases, not legally. In most cases, not safely. These are sometimes called Frankenguns- like the monster in Frankenstein that was made by stitching together parts of dead bodies.
So far as I know, these were made only in a caliber that is used only for tear gas and blank ammunition, and any safe conversion to live ammunition is HIGHLY doubtful.
On the other hand, I have seen shotguns that were made from pieces of gas pipe. I did not wish to fire those, and I would not wish to fire the one you asked about.
I am guessing that English may not be your first language, and you may be in Europe somewhere. European nations have a requirement for proof testing and marking of firearms. Means a goverment test agency did a test firing of the weapon with a high pressure cartridge. I will bet you a beer of your chosing that THAT pistol has no proof marks for ball ammunition.
What we have here is... failure- to communicate.