The Autococker Trilogy is truly an amazing marker. The problem, however, is that it is not adjustable like its predeceasing Autocockers. The Shaft Kit was designed to change that.
The Shaft Kit allows you to adjust the trigger pull as well as the timing of the marker. Due to the design of the Trilogy, the trigger pull also affects the cycle speed of the marker. This can cause a "short stroke", which is when the trigger is only pulled partially and the marker only cycles partially. The Shaft Kit minimizes the trigger pull and the amount of time that it takes the marker to cycle. This means higher rates of fire and less "short strokes".
This part is a must have for any Trilogy owner.
The Shaft Kit works on all models of the Trilogy!