I won't get my gun back? Really?
Think about this. You just used a gun to save your life or that of another innocent person. Maybe the gun cost you $1,750 because it's a gee whiz custom special. You may not ever see it again because it's been taken into evidence.
So what? Maybe it was the finer features of this precision instrument that saved your life, enabling you to shoot it well enough to out perform your attacker. That's why you bought it, right?
If so, it has served its purpose in the infinite complexity of the cosmos. Your legal fees are going to be much more significant than the gun. You'll probably have to sell it to pay for the lawyer anyway.
It's a detail. A trinket. You are alive and able to buy another one. Let it go.