Editing Airsoft (section)

=== Hop-up ===
{{Main|Hop-up (airsoft)}}
The "hop-up" system, which is installed in most stock airsoft rifles and pistols, is used to increase [[effective range]]s by putting [[backspin]] on the pellets. The [[Magnus effect]] causes the pellets to experience more [[lift (force)|lift]] as they are shot, counteracting against gravity.<ref>{{Cite web|url=https://www.abbeysupply.com/blog/The_Science_Behind_How_An_Airsoft_Hop-Up_Works.html|title=The Science Behind How An Airsoft Hop-Up Works|date=12 October 2018|publisher=Abbey Supply|archive-url=https://web.archive.org/web/20181112153255/https://www.abbeysupply.com/blog/The_Science_Behind_How_An_Airsoft_Hop-Up_Works.html|archive-date=12 November 2018|url-status=live}}</ref> A small rubber nub protrudes into the top of the barrel through a small hole, and it catches the top of the pellet as it moves past. Adjusting the hop-up makes the nub more or less protrude into the barrel, so that backspin is increased or reduced. Ideally, the hop-up should be adjusted so that the pellets fly as far as possible in a straight line without curving upward too far or dropping too quickly. Hop-Up does decrease the [[muzzle velocity]] (a gun firing {{convert|340|ft/s|m/s|abbr=on}} with the hop fully unwound can drop to as low as {{convert|300|ft/s|m/s|abbr=on}}). Ease and location of adjustment vary by gun design; some equipment provides a control that can be adjusted quickly during gameplay, while others may require partial disassembly. For example, a common location for Hop-Up adjustment is where the ejection port would be on a real firearm, which allows the machine to be covered while still allowing quick access to adjust the Hop-Up.