May I ask why you would not want a jury to view your tricked out shotgun? IMHO, if one meets the standards for use of deadly force it does not mater what firearm, or ammo one may load. The tools used commiting the deed do not matter.
I live in the Democratik Peoples Republik of California. We have a great penal code for unwanted intruders...I'll highlight a key word in it.
CPC 198.5 Any person using force intended or likely to cause death or
great bodily injury within his or her residence shall be
presumed to
have held a reasonable fear of imminent peril of death or great
bodily injury to self, family, or a member of the household when that
force is used against another person, not a member of the family or
household, who unlawfully and forcibly enters or has unlawfully and
forcibly entered the residence and the person using the force knew or
had reason to believe that an unlawful and forcible entry occurred.
As used in this section, great bodily injury means a significant
or substantial physical injury.
In the event that I have to use force and in the event that I end up with a D.A. who has an agenda and wants to make a name for himself (not like that has ever happened
) he will paint the situation that I wasn't in fear and I will have to face a jury. In a declared good shoot you don't face a jury. If I have to face a jury I don't want to have a Counter Commando'ed out gun displayed that paints me in a bad light as some crazed guy waiting for a chance to kill some hapless guy who accidently entered the wrong residence.
I want a gun that will help make my defense and that could include that the perp. was either crazy or drugged out of his skull because EVERYONE knows that no one in his right mind will advance toward a man pointing a double barrel. Even a Gun Fearing Wussie juror will find that plausible. Since my front door is at the bottom of the stairs, and I am not cutting off his opportunity to retreat any forward movement can be viewed as fear of imminent peril. It helps to know and understand your States use of force laws.
Here, the shooting will be investigated as a homicide and subject to the D.A.s discretion. We don't have Make My Day or full on Castle Doctrine; this comes close but close isn't always good enough. If I say anything that could be construed to negate my fear I could be charged with Murder 1 or 2.
As far as the P.D. taking good care of my firearm before during and after the case; I have seen otherwise. I bet on not being able to get it back without jumping through numerous hoops. They can have my Stoger or my Mossy's, but they can't have my Italian O/U's.
Another question is, why would the law enforcement people abuse your firearm as it was being cataloged into evidence? IMHO, they learn in cop school how to manage evidence.
I sat as a juror on a case where the rustball presented as the weapon "used" in the crime and bullets "matched" to it was an evidentiary reason for aquittal. That thing was was frozen shut and the defense asked how they could match a bullet to a gun that clearly was incapable of firing. It may have been the same make and model as the one shown in the pictures to us but it certainly wasn't in the same condition. In the managing of evidence, there are many hands and fingers involved and many chances for abuse, neglect, etc. Need another example...look at the Katrina guns; hundreds of examples of conficated weapons that were mishandled.
My H&R is 9 lbs and isn't bad to shoot. I looked for a double gun when I was looking for a 10, but all I could find is the H&R, the Browning BPS, and the Remington Mag 10 or whatever they call that auto. Well, I didn't wanna spend a fortune on a goose gun as I don't hunt 'em a whole lot, mostly ducks. And, I started goose hunting with a single shot 16, so the H&R brings back good memories if nothing else. 
