My oldest nephew plays paintball in a league and he referee's matches also. I bought him a cheap paintball gun when he was around 10, and he really got into it. He just graduated from highschool this past spring and I think his new paintball gun is worth more than his car. Here are some pics from a recent match:
Spoiler Alert, click show to read: 

Spoiler Alert, click show to read: 

Spoiler Alert, click show to read: 

Spoiler Alert, click show to read: