One good thing about that marker is that it's an 11/16" valve (Trilogy valve). These have better flow characteristics than the classic valves, so when compared to most other cockers of the same time period, this will be able to be tuned to be a bit nicer since the others didn't yet have 11/16" valves. In hindsight, I think K2 used this marker as the base for the trilogy that was released in 04, as this is actually the first cocker that uses the 11/16" valve*. They actually produced it using a modified Spyder valve.
*-of otherwise fully Autococker compatible markers. The Dragun Dragunfly series of markers also used modified Spyder valves, but these also used Spyder barrels, Spyder feednecks, metric threaded pneumatics that couldn't easily be replaced with cocker pneumatics, and a slightly different OD bolt that was the same length as either the 2K+ bolt or an STO, depending on the model of Dragunfly.