You should never have gun related bumper sticker or clothing. You don't want anyone to know your packing. Like the cops
I don't do bumper stickers but the two I like are:
"If you can read this you are to damn close"
"Hang up and drive"
An armed society is not always a polite society, but it is a free and safe society!
Self Defense is an absolute and natural right!
Keep your head down and your powder dry!
Is it better to do the right thing for the wrong reason, or to do the wrong thing for the right reason? If you do the wrong thing for the right reason, is it still the wrong thing?
Si vis pacem para bellum.
There are two ways of doing something. Right and again.
If you can't be good, be great at it.