Please help, I can't decide if my pistol had been demilled or damaged.

I've got in my possession an old bootleg FN service pocket pistol from Eastern Europe, but there is something funky going on inside its barrel. I can't tell if it had been demilled or a bullet exploded inside.
Looking from the outside into the barrel it appears as if an intact 9mm copper round is jammed inside. Looking from the inside it looks like silvery solder smeared all over the barrel right behind the bullet. From the length of it there seems to be no casing, only a bullet.
I tried hammering out the bullet, but I couldn't make it move either direction and didn't want to risk damaging the barrel.

I've been told it had been demilled, but there is no indication of that anywhere and I've reasons to doubt the veracity of the claim. The firing mechanism is also intact, making the gun likely to explode once fired, further discrediting the idea of demilitarizing.

Is there anyone here familiar with soviet demilling techniques to tell if my pistol had been demilled or simply damaged by a faulty bullet? Is there a better way of removing this junk than trying to hammer it out?