I have been wanting to do a Chrony test for my Webley Alecto as I didn't have a chronograph at the time of my original review. Today was the day I got around to it and I am really happy with the results I got. Mine came with the pressure release valve adjusted fairly conservatively. I imagine this is a generic setting that is set the same for both the .177 caliber and .22 caliber versions based on the lighter .177 caliber having a faster muzzle velocity and hittiing the 495 fps with less pressure required. Read full article here: https://www.replicaairguns.com/2011/4/5/webley-alecto-pcp-22-cal-air-gun-chrony-test.html Buy Webley Guns in Canada: https://www.replicaairguns.ca/search?q=webley Buy Webley Guns in the US: https://www.replicaairguns.us/search?q=webley