The Bushmaster 2000 is an electro-pneumatic paintball marker produced by Indian Creek Designs, (ICD), a manufacturer based in Idaho. Technical specification The Bushmaster is designed with tournament-style speedball in mind, being capable of shooting more than 20 paintballs per second. The marker uses two regulators to control airflow; a high-pressure regulator normally set at 200-275psi and a low pressure regulator normally set to 75-90psi. The Bushmaster operates using a ram-actuated poppet valve. Commonly the Bushmaster 2000 is referred to as a "B2K" or a "B2KX", where the X indicates the year of that particular model. The most recent 2004 model is referred to as the B2K4. The marker was recently discontinued and has been replaced by the similar, but improved, Promaster. Unfortunately Indian Creek Designs has recently decided to leave the marker manufacturing market to concentrate on other business and no longer produces either marker. The Bob Long Defiant is effectively the same design as the Bushmaster 2000 and most parts can be interchanged between the two markers. Upgrades Many upgrades are available for the Bushmaster series markers including valves, boards, frames, triggers, feednecks, bolts, ASAs and regulators. The stock barrel can also be replaced with an aftermarket barrel. The 2003 and earlier models use ICD threaded barrels while 2004 and some 2003 models use Autococker barrel threads. Other than barrels, the only other compatibility difference between different models is that of the wiring harness or board. Some models use 22-pin wiring (such as the old LCD boards) while the 12-pin is more common. A 22 pin board can be plugged into a 12 pin harness and will work correctly except for the paintball detection system. Anti-chop system An anti-chop eye system known as PDS (Paintball Detection System) is available stock on 2003 and newer models or can be installed by qualified sources. PDS uses a sender and receiver photocell that detects whether or not a paintball has been loaded into the breech of the marker. If no ball is present, the marker will not fire. This feature greatly reduces the chance of chopping a paintball that is only partially fed into the breech. Operation The operation of the Bushmaster 2000 is very similar to that of the Impulse, Intimidator or other poppet-valve based electropneumatic markers. The marker is classified as open-bolt, meaning the bolt is in the full-back position before the firing sequence. When the trigger is pulled, an