Paul Clarke, 27, was found guilty of possessing a firearm at Guildford Crown Court on Tuesday – after finding the gun and handing it personally to police officers on March 20 this year.
The jury took 20 minutes to make its conviction, and Mr Clarke now faces a minimum of five year's imprisonment for handing in the weapon.
Just by having the gun in his possession he was guilty of the charge, and has no defense in law against it, he added.
Judge Christopher Critchlow said: "This is an unusual case, but in law there is no dispute that Mr Clarke has no defense to this charge.
This is what happens in a one-size-fits-all bureaucratic system of "law" that does not allow individuals to think for themselves.
"If you don't like the law, you just need to change it!" say the statist apologists. Tell that to Paul Clarke who will now be kidnapped and placed in a cage because the "law" could not accommodate for his situation and the robot prosecutor and judge are spineless.
If it were me sitting on that jury, I would have fought for a different outcome.