In many places. Those rights innure to us as long as we follow a set of civil codes, called laws. Break them, and you lose rights reserved for the lawful.
Right where it says that he can't vote, either. Also, more generally, the emphasis on "in his own property" is a faulty argument. If the government can regulate what two consenting adults can do in their bedroom, then surely the government can regulate what an adult can shoot at in his backyard, right?
Right here:
Amendment V
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
He received due process. Therefore, it is Constitutional to forbid him from owning a gun, and to jail him if he takes possession of one.
And this guy should have known this. Ignorance of the law is no excuse.
OTOH, I could see the Executive authority of this state giving this guy a pardon at some point. While what he did was stupid and against the law, the act he was engaged in was otherwise lawful (I'm presuming here that he wasn't in violation of any other laws) and he hurt no one but himself.
Isn't this just like a probation sentence?