For young people in parts of America, guns are a normal and regular part of everyday life.
Mallory Tate, 12
"I got my first gun when I was five or six. I went on safaris in Africa and as I grew up went on rabbit hunts.
"Even when I go to school I can have a conversation with my best friend about a gun or what I shot this weekend."
Morgan Lingdon, 13
"This is such a big part of my life. I shoot every Thursday night and I'm going to be shooting every weekend. I just love the sport."
More top news
The former footballer said he hopes speaking about his grief will help others who find it difficult to talk about their feelings.
Royal Marine Alexander Blackman has spent more than three years in jail since being convicted of murdering an insurgent.
There are believed to be less than 250 of the global population remaining due to poaching and loss of habitat.