- KP Owners Group
- Page http://kpog.tripod.com/
- Technical information, serial number list, links, war stories, forum, and chatroom for owners of KP Series paintball markers by Sheridan.
- M. Carter Brown
- Page http://www.mcarterbrown.com/
- An online community of collectors of old and rare paintball equipment. Includes forums, directory of owners, and a gallery of classic markers.