There are times when you cant carry a very big gun. When I was younger I would go to the gym a lot (think back when short shorts on guys was the thing) I would have carried a tiny gun then but back then there was not as many choices as there is today.
"I ask, Sir, What is the militia?" "Its the whole of the people. To disarm the people is the best and most effectual way to enslave them" -George Mason Co-Author of the second amendment.