Airsoft Sharks does a quick video for owners of the new ASG Steyr L9-A2 GBB Pistol, giving tips on how to adjust the hop-up... "The new version of ASG Steyr L9-a2 is hop-up adjustable. Do you wonder how you can adjust the hop on asg Steyr L9-a2? Here I share a quick guide on how to adjust the Airsoft pistol Hop-Up on the field. For this you do not need any instruments, just a few BBs to test and repeat the adjustment if needed."