High Quality Content by WIKIPEDIA articles! The Indian Creek Designs BKO is part of the B2K (Bushmaster 2000) series of paintball guns. The main difference between it and the Bushmaster series of markers is rather than being fully pneumatic, the ram housing on the BKO consists of a spring return ram. The BKO was discontinued in 2004, it was made by Indian Creek Designs, located in Idaho. They also produce popular paintball markers such as the ICD Promaster, ICD Freestyle and Bushmaster 2000.