The low-pressure (LP) regulator on the Skout EVO airgun controls the air used to operate the rifle’s pneumatic cycling mechanisms—essentially managing the spool valve that releases air to propel the pellet. This is different from the high-pressure (HP) regulator, which governs the air pressure directly behind the projectile. The two regulators work in relation to one another, and fine-tuning both is key to proper cycling and overall performance.
Because the EVO platform is still relatively new, there isn’t an official manual that specifies what each pressure setting does. Part of the reason is the near-infinite variability in tuning. My own testing is still in the early stages, especially since I’ve been experimenting with modifications to the HP regulator and transfer port.
Before the modifications, the LP regulator didn’t seem to make a huge difference, but I did notice that turning it up resulted in a more forceful spool valve cycle and slightly tighter groups. Since then, I’ve made several changes: I enlarged the transfer port seat on my .177, modified the needle valve inside the HP regulator body, and refined the overall airflow path. These adjustments have allowed me to run both regulators at significantly lower pressures—while actually improving results.
Performance Comparison:
- Pre-modification:
• Pellet: 13.43 grain, .177 caliber
• Velocity: ~800 fps
• HP regulator: ~2000–2200 psi
• LP regulator: ~200 psi
• Accuracy: Good, but not outstanding - Post-modification:
• Pellet: 13.43 grain, .177 caliber
• Velocity: ~820 fps
• HP regulator: ~1000 psi
• LP regulator: ~100 psi
• Accuracy: Exceptionally tight groups—often same-hole shots
Finally, on the dwell setting: I’ve kept it as low as possible while still allowing the spool valve to open. If the dwell is set too low, the valve won’t open; set it too high, and it won’t close correctly. Striking the right balance is essential.
unfortunately, the dwell setting is not exactly like increasing or decreasing a hammer spring where you’ll see a 2-3-4-5-6 ft./s increase. Maybe just an ever so slight tightening of groups.
Hope this helps more than it adds to any confusion.
