Operation
The Autococker is essentially a pump marker with an automated pumping mechanism. It is a closed-bolt design, like all pump markers, and its operation can be broken down into two discrete phases, or cycles:
1) The Firing Cycle - The process that releases the gas that fires a paintball out of the marker is fairly simple compared to the re-cocking cycle. At rest, the bolt sits forward, closing the chamber (hence, closed-bolt). This prevents more paintballs from entering. A pull of the trigger drops the sear, which in turn releases the hammer. A spring propels the hammer forward into the valve, which causes the valve to release a burst of gas upward into the bolt. The bolt redirects the gas behind the paintball, propelling it out the barrel.
2) The Re-Cocking Cycle - Once the paintball is fired, three things must happen in order to return the marker to a "ready" state: 1) the hammer must be pulled back so that it re-engages the sear and re-compresses the spring, 2) the bolt must be pulled back so that another paintball can fall from the feed tube into the breech, and 3) the bolt must be pushed forward after the paintball is loaded to close the breech.
On both the Sniper and the Autococker, a back block performs all three of these functions. The bolt is attached to the block, while a cocking rod (which is attached to the hammer and designed to catch on the block) passes through it. When the block moves backward, it pulls the bolt back, allowing a paintball to drop into the breech. The backward movement simultaneously pulls the cocking rod back, causing the hammer to also be pulled back until it re-engages the sear. When the block moves forward, it pushes the bolt (and the paintball) forward, closing the breech. The cocking rod stays pulled back, with the hammer ready to fire.
On both the Sniper and Autococker, a pump rod runs from the front of the marker to the back block and serves as the means by which the back block moves forward and back. On the Sniper (and converted Autocockers), a pump handle is located on the front of the marker and attaches to the pump rod. After the player has pulled the trigger to fire a paintball, he/she then pulls back on the pump arm, pushing the back block rearward. This opens the bolt, allowing the next ball to be fed into the breech, and simultaneously pulls the hammer back until it is caught by the sear.
Read more about this topic: Autococker
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