The Maxx ME Pro Hop-Up unit got a new version and Highlander Airsoft compares it to the old version and the new comes in a Bronze colour. Compatible with version 2 gearbox models, especially the AR-style AEGs. It is shorter by 1mm making it compatible to even more models and it is CNC'd 6061 aviation aluminium... "Hey guys, here you can see the review of the Maxx Model Hop Up Unit (new version)."