It's a low pressure regulator, screwing it in turns up the pressure. Check out www.autocockerfaq.tk I still have some more work to do, but there's some info you might be interested in.
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The LPR is what regulates the bolt pressure. IE-how hard(how much pressure) is used to return the bolt back to the breech once the ram is actuated. So a lpr with high pressure will return the bolt back very fast, and very hard. An lpr with a low pressure settings will bring the bolt back a little more sluggishly, but may be able to stop on a paintball because of the lesser pressure behind the bolt
Look in your manual to find out which direction turning the knob will increase and reduce pressure. Once you find that out, most LPR works the same way. The pressure setting will determine how much pressure the LPR sends to the ram (via 3-way). Now you may be asking, what criteria should you use to set the pressure one way or the other.
Higher the pressure, the more air pressure you send to the ram and the faster it will push and pull the back block, which the bolt is attached to. I set mine relatively high because in this way, the cycling is very responsive to my trigger pull, quick and snappy. You donít want to set it TOO high or else the excessive vibration could be problematic. Not to mention making your gun louder. Also the higher the setting, the greater the chance a partially fed ball will be chopped. If you have a well-timed gun and a fast loader, this should be a minimal risk.
Lower the pressure and the reverse is true. You MUST set it at least high enough for the cycling to overcome the tension of the main spring, if not, the gun simply wonít work. The only main advantage to setting it relatively low is the HOPE that the lower cocking pressure MIGHT pinch a partially fed ball instead of chopping it. At this lower pressure, you will notice that when you pull the trigger, the cycling feels relatively softer or spongier compared to a higher LPR setting.
Pulling on the back block when the gun is aired up gives you a feel of your current LPR setting.
Now that you know how the LPR pressure affects your gun, play with the pressure setting to see what works best for you.