As a Catholic, I find it important to follow the admonition to love thy neighbor. To make peace with your neighbor is a blessed thing.
I would make a donation to a charity in his name and tell him how much you are praying for him. Such a charity or non profit will do much to heal the hard feelings he might have.
I suggest some of the following charities and non profits that would warm him to your good intentions:
1. Operation Rescue
2. The NRA
3. The Boy Scouts
4. The Thomas Moore Law Center
5. National Right to Life
6. Gun Owners of America
Heck you might even spring for some educational literature for him. Soon he will be overflowing with the Liberal character trait of tolerance and cultural sensitivity that is the hall mark of his ideology. But, since you are armed and he isn’t there isn’t a damn thing he can do about it.
Love your sign :-0
Don't forget to sign him up for all their newsletters. He should get all the benefits of having of having a donation made in his name. :->