If you can bare just a minute or two, you can watch this video from MiR Tactical explaining why Rocket Lab are the best upgrades for airsoft. These are available at their store right now... "Mir Tactical has all the Rocket Lab upgrades you need to make your loadout the best on the field!"
MiR Tactical show some of the upgrade parts from Rocket Lab that are available at their online store as well as complete upgraded airsoft guns. They have some HPA airsoft guns as well as AEGs for you to check out.