I won't fault anyone for carrying within his own home. However, there are things you may do to make it far more difficult for an invader to kick in your door. Whether you have a $37.00 lock or a $300.00 lock, it's the door jamb that's going to fail.
Remove the 1" brass #8 screws holding the striker in place and replace them with 2-2 1/2' #8 brass screws that reach into the house framing around your doors. You should also remove one screw from each of the hinges and replace it with a long screw.
To do this, you'll need to drill an appropriate pilot hole, then soap the screws for easing their entry.
You'll need the gun when everything else has failed.