You have a 2a. Get a gun and carry it. #1 it must work when you need it to. Spend the necessary money. #2 it must do what you may need it to do. No smaller than 9mm. #3 it must fit in your hand correctly. Every hand is different so hold and shoot different makes and models until you find what suits you best. #4 it must be reasonable to feed as #5 you must train until you a confident and then work to stay confident with it. As a citizen of this country it is a civic duty to pursue peace by posing a lethal threat to those who are lawless.