In this 5 Minute Fix Feature, Airsoft Headquarters talk about Quick Change Springs which is becoming a standard feature in newer AEGs... "This feature has been more and more requested from the player base over the years and has become a necessity for players when they make their first rifle purchase. Unfortunately there is some miscommunication with sellers that still advertise rifles as quick change spring, and while this is technically true there is a difference between quick change and 'true' quick change. Certain brands will require players to completely disassemble gearboxes away from the lower receiver to get access to that internal spring. This is becoming increasingly more difficult as more brands are utilizing ambidextrous controls even in their sportline series of rifles."