ETA- I would add this to the notion of a 6yr old with a gun. I bought my sons first gun just a few months after he was born. He was shooting firearms by time he was 3-4, was carrying a pistol when in the woods by time he was 8. The guns I bought him are his. However, as his negligence was going to be applied to me as his adult supervision, I restricted his unadulterated access to them. He's 18 in a few months. I told him he needs to buy a safe. Also, I don't have to buy him his guns anymore. He's been considering what he wants to be his first purchase.
This sounds exactly like my childhood, although I had no sidearm...I had a shotgun and a .22 hanging on a gun rack in my bedroom all my life. This was in the 80's. I would walk up my street, with a gun, and into the woods everyday after school and nobody (neighbors) ever thought a thing about it. It was normal. Personal responsibility and safety with a firearm were second nature to me, and every other kid I knew growing up who owned firearms. It comes from responsible parents.