The reason I came to that conclusion is because I believe the lpr and hpr provide the force for the forward stroke and the hpr provides the force for the rearward stroke while resisting the force of the lpr, as from the bolt pictures the vents do not connect to the rearward air chamber like in the quest. So where the hole's are (near the rear of the assembly) must be an air chamber for air that passes through the lpr (not sure whether or not the lpr is housed inside or not, but I think it is) which air seems to flow out of the little semi circles (not sure if that's where the air comes out, but it has to go somewhere) which will apply forward pressure towards the bolt moving it forward when there is no resistance (notice there is not an o-ring before the semi sphere vents like there would be on a quest bolt). I checked the specs, it has a "volumizing foregrip," so my assumption is that a solenoid controls the airflow coming from the foregrip which would direct the air towards to rear bolt o-ring (this is the area between the two rear o-rings on the bolt) when it is in the closed position, and when the marker is firing, the solenoid would redirect the air towards where the vents on the bolt are, filling the plunger section (area between the nose cone o-ring and the next o-ring) with air while also aiding the lpr pressure in moving the bolt forward. Once the bolt vents pass the nose cone o-ring air is released, firing the paintball, once the forward dwell (note, dwell is automatically calculated and FSDO is eliminated due to "Autonomous firing adjustment") is over, the solenoid redirects the air from the volumizing foregrip to the rear bolt o-ring. This allows for a large volume of air when firing, while also being able to cut off the airflow before the bolt starts to move backwards (well besides the air still in the plunger section). I am not sure if this is how it works, but based on what I see this is what I assume. Here is the drive assembly for reference:
Note, there will be a delrin tip, it's just not in the picture.
Edit: The hpr air will not aid the forward stroke because there are two o-rings that seal the air pressure from providing forward force. However, it will not resist the forward force of the lpr when the solenoid is in the open position and the hpr air is filling the plunger section.
Edited by SPARTAN1147789, 06 March 2014 - 08:27 PM.