Responsible gun owners have a duty to keep guns out of the hands of criminals. If you are forced to surrender your guns against your will make sure they are useless. Just in case they get lost on their way to be destroyed. For safety.
A dab of JB weld in the chamber should do the trick. Once the bolt closes, it ain't ever shooting again.
EDIT: To all the folks saying "Muh 1776!"... Only a small percentage of Americans went to war with the redcoats. A lot of people comply, for many reasons. This is for them, retailers especially, they can at least guarantee these guns don't go to Ukraine, Syria, ISIS, Gangbangers, etc.
Out of my cold dead hands.
I'd like to think my hands would still be warm when they tried to take them, or even hot if I grabbed the barrel while they were trying to take them. If my hands got cold they would be long gone - with my guns (except they were all lost in that boating accident).
... Unless they didn't manage to actually take them. Then MY hands wouldn't be the cold ones, and I just might suddenly "inherit" more guns (that will also likely be lost in another tragic boating accident).
edit - Yes - I know the reference. I prefer my take though.